BoschTC900 9-Piece Flat Shank Drill Bit Set , Black

Works great! Perfect kit for using the concrete screws you buy at home depot or lowes. I keep this in my tool chest at all times for the rare occasions i need to use those conrecte screws.

This set is designed for one thing only: to speed up the process of installing large numbers of 3/16” or 1/4” concrete screws. There’s a sleeve with a socket end that slides over the drill bit to drive in the screws, so you don’t have to un-chuck the drill bit to put on the driver, then un-chuck and to put the bit back on to drill the next hole.It’s a clever design, but unless you are installing more than 6-8 concrete screws at a time, it might be a little overkill to spend $30 for this set. The set also comes with two sizes of Phillips head drivers, in case your concrete screws are Phillips head and not hex-headed, although in my experience most concrete screws are both. There are also extra adapters and attachments to allow for multiple configurations.It’s a lovely set though, in a nice case. I didn’t drill enough holes to see how long the bits hold up, but I have a lot of Bosch tools and they are universally high-quality, I have no reason to doubt the longevity of the drill bits.One little screw-up though: at the factory they put the wrong Allen wrench size in the set. This means that the provided wrench would not fit into or tighten the little bolt that holds the drill bit in the adapter/chuck. I had to find a 3mm Allen wrench in my tool bag to tighten the bolt, then it worked fine. But if I had been out in the field without my own 3mm Allen wrench, the whole set would have been unusable and I would have been pissed! So deducting one star for the packaging screw-up.

The thing I like the most about the Bosch Concrete Screw Anchoring System is that it doesn't try to do too much. Although Bosch doesn't state that they designed this system for use with TAPCON Concrete Scew Anchors, they show a photo and a drawing in the product description featuring the iconic blue color and shape of the Tapcon. So that's the purpose of this nifty kit. With that in mind, it's not surprising that it only contains two drill bits since both bits correspond to the size of the required pilot hole for the Tapcon Screw Anchor. For example, the 5/32" drill bit gets used with a 3/16" Tapcon Concrete Screw Anchor, and the 3/16" drill bit gets used with a 1/4" Concrete Tapcon Screw Anchor.The Bosch Concrete Screw Anchoring System includes power bits: (1) P2, (1) P3, hex sockets: (1) 5/16", (1) 1/4", drill bits: (1) 3/16", (1) 5/32", (1) drive sleeve, (1) hex key. The P2 and P3 are the Phillips styled bits you would use with the Phillips Head Tapcon screws, while the hex sockets would get used with the Hex Head Tapcon screws.The Drive Sleeve is an innovative accessory that allows you to keep the drill bit on your drill while using one of the power bits to drive the screws. Granted, other manufacturers have this, including Tapcon. But since Bosch included it in this set, you don't have to buy it separately. Add it all up, and you have a quality concrete anchoring system that you can use with the most common Tapcon concrete screw anchors.

This is a top of the line BOSCH brand cased set with 2 small carbide tipped drill bits and hex 1/4 inch bits to let me drive special concrete/masonry screws (P.3 my blue screws). Sometimes I need to place a screw into masonry or concrete just a short way with no anchor. This requires a specific hole size and the special screws be used. This set will accomplish that though it is quite limited with only 2 carbide tipped drill bit sizes. I appreciated the good info on the package back and actually cut it out and added it to the inside of the cased set. The listing goes over the specific bits in this small set. It is Bosch great quality but the value is limited as hex bits are nothing special and this lacks extra carbide drill bit sizes. That would drop a half star but since there are no halves, I'll default to 5.I Recommend this BOSCH TC900 9-Piece Flat Shank Drill Bit Set. Handy to have all in one cased set but not a good value.I hope you’ve found the information and my review helpful.

Strong bits that grip masonry screws well. 2 sockets are also included for hex bits, along with some drill bits for concrete. The drive sleeve is sort of an extension and holds the bits well with no slippage even with a powerful hammer drill. Overall quality is very good and everything comes in a storage case which is helpful to keep everything together.The drill bits were the main thing I was interested in. Cheap bits don't last long and have to be replaced often. These bits are much stronger than generic bits and haven't worn out at all even after repeated use. They lock in tight to the bit holder with a hex screw and the hex tool is included in the kit. I've been happy with Bosch products in the past and these are probably the best bits I've used. For general use around the house, these have been great to drill holes to anchor down some posts on a concrete pad I have on my back deck.

This is a great set to have on hand with a driver sleeve all packaged in a convenient and sturdy little case.Speeds up the process for using concrete/masonry screws. Very good design and Bosch makes good stuff.The case is very convenient for some of us who have a lot of different little sets laying around, keeps everything together and easy to store and grab when you need.

The best part of this set is the tough shank for preventing slippage. Concrete screws require a lot more torque, especially toward the end of driving them in when they get deeper into the concrete. I messed up some of my regular shanks from concrete screws (they get worn out and wobbly, or the bit gets stuck).This has everything needed in a nice little carry case so you can simply grab the case instead of searching for the shank and bits separately.There are two minor things I don’t like: 1. It only has two drill bits and there is no space inside the case to carry more bits, and 2. This one is Made in China instead of Germany.

Good product