The Ko-ken RS3310M/12 3/8" Square Drive Surface Drive Deep Socket Set is a 12-piece metric set engineered for maximum torque and minimal wear on nuts and bolts. Featuring surface drive technology, these deep sockets maintain contact with the flat sides of nuts, reducing the risk of damage, especially on painted or softer materials. The set includes socket sizes 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, and 19mm, all crafted from durable chrome. Mounted on a 300mm rail for easy organization, this set is ideal for professionals seeking precision and reliability in their tools.