1/4", 3/8" and 1/2" socket hex shank adapter Rugged and durable, long service life Turn any electric/cordless drill into an electric nut driver The spring ball lock ensures a tight fit into the driver head to prevent slipping during use Suitable for electric screwdrivers, DIY enthusiasts, car repairs, etc Product description Specifications: Material: Chrome vanadium steel Color: yellow, red, blue 1/4 * 1/4 * 65mm length ------ 1/4 " shank can be converted to 6.35mm square head 3/8 * 1/4 * 65.8mm length ------ 1/4 " shank can be converted to 9.4mm square head 1/2 * 1/4 * 68mm length ------ 1/4 " shank can be converted to 12.6mm square head Package Included: 1pc * 1/4 socket adapter 1pc * 3/8 socket adapter 1pc * 1/2 socket adapter