Specifications System: Metric system All Sockets Standard 1/4" Hex Shank Color: Silver, Black Quantity: 3pcs Size: 1/4" hex shank to 1/4" socket---- 1/4 " shank can be converted to 1/4\'\'(6.35mm) square head 1/4" hex shank to 3/8" socket----- 1/4 " shank can be converted to 3/8\'\'(9.53mm) square head 1/4" hex shank to 1/2" socket ----1/4 " shank can be converted to (1/2\'\')12.7mm square head Package Included: 3Pcs Drill Socket Features 1. Made of quality CR-V material in fine workmanship that is hard, durable and precise. 2. The spring ball lock ensures a tight fit into the driver head to prevent slipping during use. Specifically machined to fit securely into a hand held driver, drill driver or impact wrench. 3. Lightweight, fast, connect to the standard hex screwdriver.Functional head has locking & magnetic function. 4. Gears housed in die cast body with 3 sets of ball bearings for long lasting durability 1/4 inch hex drive shaft is quick change compatible and fits most power drill and driver chucks. Notes 1. Please allow slight measuring deviation due to manual measurement. 2. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 3.Please leaving a message before you give the bad feedback, if the products have some problems.Thanks for your understandings.