Economical and practical, the choice of quality Bosch four-pit 1 series rotary hammer drill bit SDS plus-1 Dr. Rotary Hammer Drill SDS plus-1 Applicable tools Rotary hammers with SDS plus (round shank four-pit) clamping system Applicable Materials: Concrete, Lime and Sand Bricks, Solid Bricks, Concrete Blocks, Hard Stone Features: The rugged carbide bits are more durable Smooth drilling Double drain tank design provides better dust removal effect Product application: Cement drilling, brick wall drilling