Feature:1. 1 or 4-inch Hex Shank Prevents Stripping During High Speed Drill Operation2. Super Strong Heat Treated Chrome Vanadium Steel for Normal andamp Impact3. Use - Sandblasted Finish4. Converts All Power Drills into Speedy Socket Drivers5. Applies to the screwdriver handle or electricSpecification:screwdriver tools (hexagonal hole or three jaw chuck can be)driven sleeve is used, can be the original hexagonal side afterinstallation on size into square size, which can be used for the installation of the sleeve, is a good accessories to convertDescriptionSize: inch Length1 or 4and 39 and 39 x1 or 4and 39 and 39 x50mm- 1 or 4and 39 and 39 shank can be converted into 6.35 mm square3 or 8and 39 and 39 x1 or 4and 39 and 39 x50mm- 1 or 4and 39 and 39 shank can be converted into 9.53 mm square1 or 2and 39 and 39 x1 or 4and 39 and 39 x50mm- 1 or 4and 39 and 39 shank can be converted into 12.7 mm squareMaterial: Chrome vanadium steel cr-vQuantity: 1 set(3pcs)Package List:3 x Socket Adapter Hex Shank set