The Crescent CTK30SETN is a socket and tool set with a measurement system of imperial metric. The Crescent CTK30SETN Features: World famous crescent brand Providing quality tools since 1907 Professional quality, cr-v 3/8 inch drive ratchet handle:6 inch extension:3 inch extension Metric sockets:9, 10, 12, 13, 14, 15, 17, 19 SAE sockets:5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4 Deep metric sockets:12, 13, 14, 16, 17 Deep SAE sockets:7/16 , 1/2, 9/16, 5/8, 11/16 13/16 inch spark plug socket The...