Shop grippers are tools used to hold objects in place while they are being worked on. Vises, CLAMPS, and C-CLAMPS are all types of shop grippers. Vises are tools with two jaws that can be tightened to hold an object in place. CLAMPS are tools with two arms that can be tightened to hold an object in place. C-CLAMPS are tools with a screw that can be tightened to hold an object in place. All three of these tools are used to securely hold objects in place while they are being worked on.