Gyros 1 &frac12;&rdquo; Cut-Off Wheels, Fiberglass Reinforced, Low-Tensile Strength -12 Pack. Works with Dremel Tools For Materials Such As Wood, Aluminum, Stone, Ceramic, Copper And Brass. Made in USA Gyros low-tensile strength cut-off wheels are reinforced to resist breakage and for long term use. They are 1  in diameter 1/32 thick with a center hole of 1/8 Maximum Operation Speed: 45,000 RPM Low Tensile Disc is specially manufactured and designed for swift cutting of plastic, aluminum, stone, ceramic, copper, wood, brass and such materials Cutting Wheels Works with Dremel and similar Rotary Tools. Package Contains: 12 High-quality Cut-Off Wheels and 2 washers. Use with Mandrel No. 80-18100 Made in the USA