Impact-resistant drill bit with 1/4" hex shank, optimized for impact drivers Titanium nitride coating dissipates heat and allows the drill to be used even at high speeds Set includes: 2.0; 2.5; 3.0; 3.2; 3.5; 4.0; 4.5; 4.8; 5.0; 5.5; 6.0; 6.5; 7.0; 7.5; 8.0; 8.5; 9.0; 9.5; 10.0; 10.5; 11.0; 11.5; 12.0; 12.5; 13.0 mm drill bits