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Name: Hex Drill Nut Driver Power Extension Bar Material: Chrome vanadium steel CR-V Quantity: 8pcs Specifications: 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 Uses: 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. Package included: 8pcs Drill Nut Driver Power Extension Bar