Features: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 NewMaterial: Chrome-vanadium SteelColor: Silver GrayOptional Type: #1(6pcs/set), #2(5pcs/set)#1:1/2*1/4*73mm: 1/4in hex shank to 12.7mm square head3/8*1/4*65mm: 1/4in hex shank to 9.53mm square head1/4*1/4*65mm: 1/4in hex shank to 6.35mm square head1/2*1/4*50mm: 1/4in hex shank to 12.7mm square head3/8*1/4*50mm: 1/4in hex shank to 9.53mm square head1/4*1/4*50mm: 1/4in hex shank to 6.35mm square head#2:1/2*1/4*50mm: 1/4in hex shank to 12.7mm square head3/8*1/4*50mm: 1/4in hex shank to 9.53mm square head1/4*1/4*50mm: 1/4in hex shank to 6.35mm square head1/4*1/4*25mm: 1/4in hex shank to 6.35mm square head1/4*1/4*30mm: 1/4in hex shank to 6.35mm square headWeight: approx. 83~160gPackage Included:1 x 6pcs/set OR 5pcs/set Socket Bit Adapter