Specifications: Ultra-Strong Heat Treated Chrome Vanadium Steel 3/8" drive adapter comprises of sizes: T20-T55 in both long and short series bits. 7 Short (30mm) length: T20,T25,T30,T40,T45,T50,T55 7 Long (75mm) length: T20,T25,T30,T40,T45,T50,T55 Includes 1pc Bit Adapter 1/2" Drive x m10 Includes size marked storage case for quick and easy storage