As an engineer in the Industrial and Scientific field I'm always in need of reliable and accurate workholding tools... The TECHNIKS SUPER PRECISION COLLET ACCURACY tool has not disappointed me in anyway. The accuracy and precision provided by the collet are unbeatable, and there are no complaints regarding its durability. The only slight drawback is the steep price, but it's worth every penny for the quality it provides. Overall, I highly recommend this product for those in need of precision workholding tools..