Rotary Hammer Drill: 1 1/2 in Drill Bit Size, 17 in Max Drilling Dp, 22 in Overall Lg

MILWAUKEE MODEL 48-20-4151, The spline shank on these drill bits prevents them from slipping in high-torque drilling applications when creating holes in concrete and masonry. The bits install into rotary hammer drills with spline-drive chucks, which have 12 grooves that mesh with matching grooves on the bits' shanks to hold them in place in the chucks.