Long and Short Hex Set including 4 piece Long Hex Sizes: 6mm, 7mm, 8mm, and 10mm. The long sockets are 4 inches overall length, 3/8 Drive. Plus Hex Super Stubbies 1/4 Drive 5 Pc Set Metric Hex in small popular sizes. These small sockets are one inch long. These are the sturdy one piece Design Sockets on a rail - great for working on German Cars. Stubby Sizes: 3mm, 4, 5, 7 and 10mm Heat treated to 56 to 62 RC. Satin Chrome plating. The small sockets are made of S2 Alloy Steel, some of the strongest drivers available