kwb Drill Bits & Parts Hammer drill bit 610610 - KWB 260510, The kwb 260510 hammer drill bit is a 10 mm masonry drill bit made from 40Cr steel with a total length of 110 mm. This SDS-Plus bit is ideal for drilling into stone, brickwork, and other hard materials. Manufactured by kwb, it is designed for efficient and precise performance in construction and renovation tasks. kwb 260510 Hammer Drill Bit 10mm x 110mm SDS-Plus 4-edged Concrete