This diameter spring plunger is a game-changer for my workholding projects .When i tried this product I was pleasantly surprised by its sturdiness and how it held up to CONSTANT use. The plastic knurled design also provided an excellent grip surface for adjusting the tension. As an industrial worker, this tool saved me valuable time and provided consistency in my work. The only drawback I found was the initial learning curve with adjusting the plunger's tension. Overall, a reliable addition to any industrial and scientific toolkit..