• It has a self-clamping effect to hold the samples tightly, and it is very easy to clamp or release the samples. • Parts of hard may cause slip since the initial grip force might be not enough. This needs to be checked before testing the samples. • Surface of the gripped area is flat. We can be manufactured “V” shaped surface of the round rod in custom order. • GC-57~59S are fixed position type wedge grip.