Notched blocks and strap clamp make setups quicker when holding hard-to-clamp parts like castings. Six pairs of 10-32 studs from 1" to 3-1/2" long fit included T-nuts for a wide range of height adjustment. Third block included so it can be cut to smaller sizes for special low setups. Special concave/convex nut and washer combination adjusts to clamps that are not perfectly parallel to table for even hold-down pressure.