Fitted with a traveling spindle and collar, the 5-C Spin Index is unmatched for forming, grinding, and inspecting end mills and other fluted cutting tools. This spin index accepts 5-C collets up to 1-1/8 capacity and features a 36 hole indexing plate with 10 vernier holes for indexing to 1 degree. Locking spindle is hardened and ground and has 2-1/16 of travel.