GRS QC (Quick Change) graver handles are used together with the GRS QC Tool Holders (see related products below). The handles in the set are in 3 different lengths so that you can use progressively longer handles as your gravers become shorter through wear and re-sharpening. The 3 handle lengths are 2", 2 1/4" and 2 1/2" (50, 57, and 64 mm). Each handle is made from machined stainless steel and a nearly indestructible, fiber-reinforced thermoplastic. The handles are furnished with an acrylic storage tray that can hold the handles and up to seven QC Tool Holders with mounted gravers/tools. The tray fits all GRS tool carousels. Made in USA.