DEWALTMasonry Drill Bit Set, Percussion, 4-Piece (DW5204)

As brocas sao boas nas deveria vir numa caixa

I've only used the 5/16" bit so far, but it's gone through a bunch of holes in cement block like a champ. I'm expecting similarly excellent results from all the bits whether the holes need to be put through block, brick or concrete.The fit and finish is very good, with high-quality brazing holding the carbide inserts in place, and the pointed tip of the inserts work well when starting the hole. The bits are straight enough that I don't see anything problematic by eye during rotation in my cordless hammer drill, though the hammer drill does have a pretty good chuck in terms of runout.Oh, and the best part? The 5/16" bit was able to easily ream out multiple holes in 1/4" mild steel plate (the holes were probably around 0.310" or so) before shooting through the masonry behind the plate. No issues, and gave me a perfect fit for my brackets.Also, they're made in Germany, which helps.

Installing a new patio in my backyard and had 3 concrete slabs to remove. They were far too heavy and thick to pick up in one pieceEnter this concrete chisel.Technique used:1) Drill pilot holes into concrete as deep as I could with the drill bits and a cordless dewalt hammer drill2) Used Chisel (http://www.amazon.com/gp/product/B000NIBFT4/ref=cm_cr_mts_prod_img) and a sledge hammer to then break off pieces of concrete3) used angle grinder to cut through the rebarThe only hammer drill I had was a cordless Dewalt. i was concerned when purchasing these that the cordless drill would not be able to provide enough omph, but I was totally wrong. The concrete was a mix of stone and concrete. Two of the concrete pieces had rebar inside. These drill bits chomped through the concrete easily and showed no sign of giving up. Several times I had to stop work and let the drill bits cool down as there was smoke coming from the holes, but after a couple of minutes they were ready to go again.Another great dewalt product.All in all, great product for a great price.See pictures attached

Good for small jobs

I used the brill bit with my normal electric brill and they worked amazing. Drilled 10 holes to hang a TV in concrete real fast. Excellent quality and product