General description Set of 10 drill bits BOSCH EXPERT CYL-9 MultiConstruction Ø 4 x 75 mm designed for maximum precision drilling in multiple materials. These drill bits are up to 5 times more precise than standard drill bits, making accurate drilling easy with their patented Bosch Centering Geometry. The specially-designed centering tip allows for accurate start holes. Technical specifications Diameter: 4 mm Length: 75 mm Set includes: 10 drill bits Compatibility and accessories Cylindrical shank compatible with three-jaw drill chucks