Set of 4 - 4" Donut Wheel, Round Face, Holes, Fine, Medium, Coarse, Extra Coarse Grit, Bore Size 5/8&rdquo; - Carving Wheels - Saburr Tooth - Rotary, Power Carving Tool Saburr-Tooth - 100% Made in USA. The Best Power Carving Tool! Not for use on METAL or CERAMICS. Best used in Industries: Power Carving, Wood Working, Furniture, Ice-carving, Sculpting Dental Labs, Orthotic Labs, Taxidermy, Pattern Shops, DIY., Hobbyist LOG Home Building, Construction, CNCMachining, Milling Ideal for use on difficult to cut materials: Wood, Rubber, Silicone Plastic, Foam, Bone, Ice, Fiberglass, Polyurethane, Epoxies, Acrylics, Composites, Graphite, Soap Stone, Alabaster Recommended Operation Speed: 4,000 to 25,000 RPM