Quick Change Bit Set 20pcs 8pcs hex shank drill 8pcs 50mm bit 3pcs nut driver 1pc copper quick coupler Quick Change Bit SetSize: 8pcs hex shank drill. Zinc alloy,1/16", 5/64", 3/32", 7/64", 1/8", 5/32",3/16", 7/32" 8pcs 50mm bit, slotted: 3/16", 1/4"; Phillips:PH1, PH2; Star:T15,T20; 6-hex: 1/8", 3/16"; 3pcs Nut driver, sanding blast: 1/4", 5/16", 3/8" 1pc Copper quick coupler