Specifications: It is made of high quality materials, which has high hardness, good toughness, rust protection and good anti-corrosion. This square bit socket set is perfect for use with breaker bars, torque wrenches, and ratchets. With mini size, it is lightweight, which is easy to carry. Item Name: Spline Bit Sockets Material: Chrome Vanadium Steel Quantity: 10Pcs/Set Features: Durable, Lightweight, Rustproof, Anti-Corrosion 12 Point Spline Bit: Bit M4/M5/M6 Square Bit Size: 1(6.35mm), Length: 37mm(Approx.) Bit M8/M9/M10/M12 Square Bit Size: 3(10mm), Length: 48mm(Approx.) 12 Point Middle Hole Bit: Bit M14 Square Bit Size: 3(10mm), Length: 48mm(Approx.) Bit MT6/M18 Square Bit Size: 1(12.6mm), Length: 55mm(Approx.)   Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.   Package Includes: 10 x Spline Bit Sockets