Kobalt 64-piece Standard/metric Mechanic's Tool Set with Case 64-Piece Standard/Metric Drive ratchet extension sizes are 1/4-in, 3/8-in, and 1/2-in Set includes 36 sockets, 24 drive tools, 3 extensions, ratchet handle and case Large laser etched easy-to-read size callouts Sockets are marked with a color-coded band to easily identify SAE (red) and Metric (blue)