Proform heavy-duty spring tester is an excellent tool for precisely measuring the height and pressure of your springs. You can use it to check springs that have a diameter of up to 2 inches and a height of up to 4 inches. The tester is designed for use on a workbench or vice and is incredibly durable. With its exceptional build quality, it will withstand heavy usage over an extended period. Features: Has a 300LB RatingCheck Springs Up to a 2-in. Maximum Spring Diameter and a 4-in. Maximum HeightMade from Lightweight Billet AluminumRed Finishfor Vise or Bench Mount Use