1/4 Hex Shank:Our hanger bolt drivers feature a 1/4 hex shank design that fits most power drills Widely Used:Suitable for double headed screws,hanger bolts,fully threaded rods;Used in situations that require disassembly or enhanced stability,such as furniture assembly,instrument assembly,DIY wooden crafts Effort-saving:Hitting with a hammer can easily damage the material and injure your fingers;With our hanger bolt driver,you can quickly tighten or loosen stud screws;While improving your work efficiency,you can also achieve professional and nice results Strong Hard Metal:Made of hard metal,sturdy,and can withstand the strong impact of an electric drill,and is not easily damaged after repeated use Easy to Use:Simply drive the screws into the hanger bolt driver and attach the hex head to a drill or impact driver to secure the screws to wood or other instruments