Giant, steel ''''pliers'''' has two machined ''''steps'''' that can tighten one or both rails with just a ''''squeeze'''' of your bench vise. Step one distributes pressure evenly to both rails at the same time. Step two straightens and adjusts one side at a time if the slide is bent or sprung. Stop bolt helps prevent over-tightening and damaged slides. Mfg: Power Custom SPECS: Heat-treated steel, blued finish. Machined from 1-A 1/2'''' (3.81cm) square stock, approx. 7-A 1/2'''' (19cm) long. Ratio 2:1.