Review on 💪 Durable & Efficient: DEWALT DW5427 8 Inch 4 Inch CARBIDE Bit for Precise Drilling by Dwayne Pore

god these things suck. I don't know why people give high ratings. Each bit can drill four times to a depth of 3 inches and that's it. I bought two for work to drill 16 holes. After a total of seven holes, both were shot. I bought two more and barely had time to finish them. Then I had another job which again required me to drill 16 3" deep holes in another concrete slab. Again I made about 7 holes with two bits. I didn't have time to order more of these bits so I went in went to the hardware store and bought the M.BOOM brand, one of these different bits made the other 9 holes with no problems, with Dewalt bits it was 5-10 minutes per hole, with bits from different manufacturers it was 1 minute per hole.