1Adopting chrome-vanadium steel material, the socket bit adapter is of high harness, strong strength and long durability 2The spring loaded ball bearing firmly holds the socket 31/4inch hexagonal shank is suitable for all quick change chuck and standard drill chuck 4A great tool to change the hexagonal size into square size, convenient for the installation of socket bits 5It can be installed at the pneumatic screw driver, electric screw driver, electric drills and more electric toolsFeatures: Adopting chrome-vanadium steel material, the socket bit adapter is of high harness, strong strength and long durability. The spring loaded ball bearing firmly holds the socket. 1/4inch hexagonal shank is suitable for all quick change chuck and standard drill chuck. A great tool to change the hexagonal size into square size, convenient for the installation of socket bits. It can be installed at the pneumatic screw driver, electric screw driver, electric drills and more electric tools. Specifications: Condition: 100% Brand New Material: Chrome-vanadium Steel Color: Silver Gray Optional Type: Long Type, Short Type Long Type: 1/2*1/4*73mm: 1/4in hex shank to 12.7mm square head 3/8*1/4*65mm: 1/4in hex shank to 9.53mm square head 1/4*1/4*65mm: 1/4in hex shank to 6.35mm square head Short Type: 1/2*1/4*50mm: 1/4in hex shank to 12.7mm square head 3/8*1/4*50mm: 1/4in hex shank to 9.53mm square head 1/4*1/4*50mm: 1/4in hex shank to 6.35mm square head Weight: approx. 68~91g Package Included: 1 x 3pcs/set Socket Bit Adapter