Type 27 depressed-center wheel for use on all types of metal and masonry. Designed for offhand cut-off; operates at 90deg angle. Also ideal for notching or cleaning pipes and weld beads. 5/8in. arbor. U.S.A. Arbor Size (in.): 5/8, Wheels (qty.): 1, Wheel Diameter (in.): 4 1/2, Wheel Thickness (in.): 1/8, Thread Size: 11, Wheel Type: Metal, masonry grinding wheel