This 3 piece set works great for removing rounded off nuts and bolts or gripping odd shaped parts.   Features: 5 inch opens up to 7/8 of an inch 7 inch opens up to 1 3/8 of an inch 10 inch opens up to 1 9/16 of an inch Hardened and tempered milled teeth Quick release levers Thumb screw knob adjusts lock jaw capacity Professional quality