ITEM NAME:8Pcs Socket Bits Adapter Set Hex Drill Nut Driver Power Bar Shank 1/4" 3/8" 1/2" Product Description Description: Features: Suitable for a screwdriver handle or electric screwdriver tool (hexagonal hole or three-jaw chuck) drive sleeve to use. After install the original hexagonal size can be converted to square head size,so use to install the sleeve. Specifications: Material: hrome vanadium steel CR-V Product size: approx. Turn 1/2"( 12.5mm) ,3/8" (10mm) ,1/4" (6.3mm) connector Net weight: approx. 180g 1/4 * 1/4 * 50mm length---1/4 " shank can be converted to 6.35mm square head 3/8 * 1/4 * 50mm length---1/4 " shank can be converted to 9.53mm square head 1/2 * 1/4 * 50mm length---1/4 " shank can be converted to 12.7mm square head 1/4 * 1/4 * 65mm length---1/4 " shank can be converted to 6.35mm square head 3/8 * 1/4 * 65mm length---1/4 " shank can be converted to 9.53mm square head 1/2 * 1/4 * 73mm length---1/4 " shank can be converted to 12.7mm square head 1/4 * 1/4 * 25mm length---1/4 " shank can be converted to 6.35mm square head 1/4 * 1/4 * 30mm length---1/4 " shank can be converted to 6.35mm square head Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. Included: 8 x Drill Nut Driver Power Extension Bar.1/4 1/4 50mm length---1/4 " shank can be converted to 6.35mm square head. 3/8 1/4 50mm length---1/4 " shank can be converted to 9.53mm square head. 1/2 1/4 50mm length---1/4 " shank can be converted to 12.7mm square head.