Fits all types of sockets, bits - Install directly on the drill chuck, or on a 1/4 "" socket holder. Professional adapter set, sturdy and durable. Fits all cordless drills and screwdrivers. 1/4 "", 1/2 "", 3/8 "" Hex Socket Holder - Fits all quick change adapters, extensions and drill chucks. Simple differentiation by color marking. Suitable for DIY, professional, auto parts, repairs and more. Product Description : Dimensions: 1/4 x 1/4 x 65mm in length - The 1/4 "" shank can be converted to a 6.35mm square head. 3/8 x 1/4 x 65mm in length - The 1/4 "" shank can be converted to a 9.4mm square head. 1/2 x 1/4 x 72mm in length - The 1/4 "" shank can be converted to a 12.6mm square head. Includes: 1 socket holder (1/4 "" hexagonal shank and 1/4 "" connector). 1 socket holder (1/4 "" hexagonal shank and 3/8 "" connector). 1 socket holder (1/4 "" hexagonal shank and 1/2 "" connector). Scope of delivery: 1 set of 3 socket holders.