Master Mechanic, 17 Piece, Titanium Drill & 40 Piece, Screwdriver Bit Set Combo Pack, Titanium Lasts 3 Times Longer Then Black Oxide, Most Popular Sizes Included, Screwdriver Bits Tempered & Hardened For Longer Life, Ideal Assortment Of Drill & Screwdriver Bits For The Home Owner Or Contractor, Combined Combo Set Breaks Into Two Existing Sets For Easy After Promotional Sell Through.