Irwin IR3 Vice No. 3 4"/100mm Description: These vices are robust and durable. The base and the sliding element are made of strong cast iron, which has been machined at all friction surfaces to ensure smooth and reliable operation. The jaws, handle, and main screw are made of steel, with the latter featuring a double trapezoidal thread to allow for quick and complete opening and closing of the jaws with a minimal number of turns. This is the most commonly used band screw in the Irwin product range. Technical specifications: Jaw width 100 mm, throat depth 121 mm, clamping height 70 mm.