Based on our own experience, this retractable SPRING plunger is an incredible addition to our workholding arsenal .The lock-out feature saves time and frustration by ensuring secure placement and the stubby design allows for ease of use in tight spaces. This is a game-changer for any industrial setting. The only downside is the price point, but the quality and performance make it worth the investment. Industrial and Scientific professionals, do not hesitate to add this to your toolkit..