Screwdriver - Combo Set 15 in One Screwdriver is Engineered for heavy-duty construction. Bits are long-lasting and made of chrome vanadium 6150 steel. 6-in-One Driver offers: 1/4" Slotted Bit, 3/16" Slotted Bit, #1 Phillips, #2 Phillips, 5/16" Nut Driver and 1/4" Nut Driver. Best Tool Set to be fully equipped