The Ko-ken RS4310M/10 1/2" Square Drive Socket Set is a versatile 10-piece collection of surface drive deep sockets designed to enhance torque transmission while minimizing wear on fasteners. This set includes metric sizes 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 17mm, 19mm, 21mm, and 22mm, allowing for effective engagement 10 piece 1/2 Sq. Dr. Surface Drive, Deep, Metric, 6 Point Socket Set