This damaged stud and bolt extractor 3/8 inch drive,suitable for most drive tools:1/4 inch to 1/2 inch (6mm to 12mm),can be used with manual or pneumatic impact wrenches and ratchets as as adjustable wrenches and flat wrenches. Made of high-grade heat-treated steel manufactured with a chrome-plated surface for extreme durability and additional rust protection. Simple to operate without thinking. Place the stud extractor on the stud and turn the bottom hex flat nut counterclockwise to tighten the jaws. After the jaws firmly grip the broken stud or bolt, continue to turn the stud counterclockwise until it is removed. Then release and separate in a clockwise direction. This stud and bolt extractor will help you more rest time. It is suitable for exhaust manifold damage, oil filler plugs, round , low grade left in salt water, painted , and rusted tight . stud extractor force users to at the size of damaged studs,wasting space and cost,so we designed this auto-adjusting extractor that will eliminate your irritation and frustration ,and it is definitely a great addition to your toolbox. Material: Metal colour: silver Package Contents: 1 x easy out bolt extractor set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.