C k quick change bit drill set ck tools t4519 simple quick change of drill accessories by click release swap from drill to screwdriver bit with out re chucking saving time and effort 3 8 hex shaft contents one each of quick change chuck bit holder bits slotted 4 5 6 7mm pz1 2 3 ph1 2 3 hex 3 4 5 6 7mm tx10 15 20 25 30 40 ck tools t4519 quick change bit drill set