Chrome Vanadium Steel Socket Adapter Hex Chuck for 1/4" 3/8" 1/2" Bit Extension Bit Set Power Tool Allen Bits 3Pcs/Set Features Application: Suitable for screwdriver chuck or electric screwdriver (hex or three jaw chuck. Hexagonal connector can be converted into a square head after installation Perfect conversion tool Stainless steel lock ball ensures a secure fit. The sockets snap tightly, they do not slip off. The 1/4" (6.35mm) hex chuck prevents stripping when operating at high speeds. The high-quality material will be very long, much more than expected. Specification: Item Name: Adapter Drill Bit Set Color: As Shown in the Picture Material: Chrome Vanadium Stainless Steel CR V Stainless Steel Size: 1/4"*1/4"*51mm(Length) Shank 1/4" can be made into 6.35mm Shank 3/8"*1/4"*50mm(Length) 1/4" can be made into 9.5mm Shank 1/2"*1/4"*52mm(Length) 1/4" can be made into 12.7mm square Package Included: Socket Adapter Hex Shank Set (Includes 3pcs)