Instead of a pricey vise, this bench uses shop-made clamp blocks that hold typical one-hand ratcheting bar clamps inserted through holes in the bench's front and end aprons, left. After removing the fixed jaw, the bar fits into the groove of the clamp block, and the bar's roll pin holds the clamp in place once inserted, below left.These clamp blocks are designed to work with Irwin SL300 and Jorgensen ISD 3 expandable bar clamps. If you have a different clamp, test its fit in the blocks and make modifications to the grooves as needed, or install a larger roll pin in the clamp bar.