Countersink Drill Bit (7 PCS), Drill Bit Set with One Hex Key, High-Speed Steel Drill Adjustable Carpentry Reamer Plated for Wood DIY (3-10mm)

I received the set quickly since I have prime. First use of the bits I noticed the smallest bit was bent from the package. I contacted the seller and the next day they sent an email apologizing and said the replacement was on it’s way. The bits themselves work as they should but I have to really tighten the taper set screw otherwise it’ll spin when countersinking the hole. Overall I’m satisfied with my purchase.

Used the smallest two bits first. The metal collar spun so I had to tighten it, the Allen set screw wasn’t squared off enough for the Allen key provided. Or any Allen key to be honest. Not sure what the issue was but it was like they were “stripped”. After carefully tightening it, still don’t know how I did it, I began to drill the hole. About halfway down the 5-6 hole, the bit it snapped. Drilling straight, soft enough wood etc. I took out the next size up and same thing. Disappointing to say the least. The next size up was too big so I ended up using the “nub” because I was in a bind. I ended up grabbing a bit from a local hardware store (for the price of this whole set for one bit) and it worked fine for the remaining 15 holes. So it wasn’t the wood, the drill, me or anything. I thought these would be a great set as they se hefty enough both in the picture and in person.

First time I used the smallest bit, it broke. I ended up just putting a new better quality brad point drill bit into it. I'm hoping the larger bits will do better. I was going to return it, but reading the reviews, I haven't seen a set of these that got great raves. Seems they all break.

Attempted to use once. Did not perform as desired as it chewed, not cut the hole. After working with the vendor it may have been my wood was too soft, not the fault of the tool.Excellent responsiveness from the vendor.

Whats great is you can very easily change the depth so you can adjust where the countersink portion is. It did not chatter like some of the other cheap ones I have bought. I have much better luck getting this countersink drill set! I will continue to purchase this brand.

This product comes in a small cardboard container lined with durable foam as shown. Each counterbore bit comes with the appropriate size boring bit and an allen wrench to tighten the set screws that hold the boring bits in place.Check for tightness before using as it is much easier to adjust and tighten that wat. The screw on the #8 bit held onto the wrench for dear life and it took pliars to remove it.This set is unmarked, so you will need a handy gauge to figure out the size.It’s also hard to tell how deep the counterbore hole is. This is easily solved by flagging the bit with tape, but i like the “built in” markings on the more expensive bits.When drilling, you need to apply more downward pressure than you might expect. The picture of drilled holes shows how ‘rough ‘ edges are on left and how the #8 broke off in fairly soft treated pine 5/4 deck board.I gave it two stars — one for rapid delivery and one for decent packaging. Unfortunately, my first use was after the return window closed.

PROS:1. You can slide the countersink attachment up and down the solid part of the drill bit shaft to set drilling depth to a degree;2. You can replace the drill bits with higher quality drill bits.. but you might need to.CONS:1. Quality is terrible - there are filing marks on the countersink attachment slots;2. The drill bits don't center in the countersink attachment holes when held down by the grub screws;3. The drill bits seem good for soft wood only, but are replaceable.4. The item is non-returnableBuy DEWALT instead. You probably dont need 7 different sizes and DEWALT has hex heads for driver use:https://www.amazon.com/gp/product/B0000225OU

Hahaha the picture shows a kid book.. but truly I got what I ordered, the bit set. So one came loose so I fixed it...