This high speed abrasive roll mandrel is 6" long with a 1/4" shank. The 1/8" diameter pilot is 1" long. For best results use this and all Abrasive Roll Mandrels with light side pressure to avoid bending. For a smoother cut & longer abrasive life use Grinders Grease (13119). We recommend the use of a dust mask like our Disposable Dust Masks (22055) pk of 20, Goggles (43090), and ear protection during all grinding operations.