Bosch carbide twist drill concrete set straight shank bosch 2607017083 these carbide twist drill sets from bosch are suitable for drilling in stone concrete and masonry 7 piece cyl 3 concrete drill bit set 4 5 5 5 6 7 8 10 mm bosch 2607017083 carbide twist drill concrete set straight shank 4 to 10mm 7 pcs