Description: 1. The tack remover tool uses a 3/8-inch drive, which is best used with an impact wrench and ratchet. Also compatible with flat wrenches, adjustable wrenches, sockets and locking pliers. 2. This extractor tool is adjustable to fit 1/4 to 1/2 inch (6mm to 12mm) bolts. Constructed of a chrome vanadium body with chrome moly and will quickly remove broken and damaged threaded studs. 3. This puller tool is easy to operate and can help you get more rest time, whether it is the exhaust manifold, fuel plug, the broken bolts, or the broken, painted, rusty set screws, the posts are effectively removed, But the threaded surface can be used slightly due to the strong clamping force. Operational Guide: Place the tack puller on the bolt and turn the flat bottom hex nut counterclockwise to tighten the After the hold the bolt or broken bolt firmly, continue turning the bolt counterclockwise until it is removed. then release and detach clockwise. But the threaded surface can be used lightly due to the strong clamping force. Specifications: Color: Silver + Black Scope of application: 6-13mm Material: Metal Package includes: 1 * broken bolt remover