This unit is sold with no attachments allowing you to add the attachments that will work best for you. Farriers can run this unit at 1800rpm if they are sharpening knives, or the normal 3600rpm for grinding shoes and other items. This grinder has a 5/8” shaft, which is the same as the BG12 unit. The toggle switch shows a fast option, 3600rpm or slow option, 1800rpm.