The irwin record t6ton6vs workshop vice with anvil is specifically designed for medium duty workshop applications for both the professional craftsman and the diy enthusiast strong and durable the body and sliding jaw are cast from close grained grey iron which is machined on all friction surfaces for a smooth reliable action the jaws handle and main screw are steel the main screw has a two start rolled acme thread to speed the jaws from fully closed to fully open with a minimum of winding specif