Here at HSS, we have a range of thumbs crews in many different sizes and perfect for many uses. A thumb screw is a screw that is designed to be tightened and loosened by hand without the use of any tooling. The head of the thumb screw is knurled to provide extra grip and prevent slippage when tightening and loosening. The head diameter is large for ease of use and also provides a high degree of rotational accuracy. Whatever you need, we have it at the touch of a button.