Description: 【Durable Material】The electric wrench shaft is made of high quality alloy steel, high hardness, wear resistant, which is sturdy and durable. 【Square Shaft】3/8" or 1/2" Impact Grade Socket Adapter,.Hex Shank Adapter Drill Nut Driver, Power Extension Bit Set for Drills. Standard hex handle interface. 【Portable】The portable impact wrench shaft attachment is small and lightweight, easy to store and carry. 【Easy to Use】Four quare sleeve shaft, easy to install and remove, not easy to fall off. Rustproof, anti skid, flexible fastening. 【Wide Application】Electric drill adapter for tight space, power tool replacement shaft connectable hex shanks, hole openers, bits, sockets and other adapters, great for drill, screwing, wrench. Specification: Material: Steel10mm:  3/8",Electric drill to electric board rod 13mm:  1/2",Electric drill to electric board rod Size Chart: 6cmx1.8cm/2.36inchx0.71inch   Package Includes: 1 Piece Impact Wrench Adapter Note: Please allow slightly errors due to manual measurement and different monitors.