Rotary Diamond Cutting Discs Quantity = 5 diamond Cutting Discs plus 1/8" shank with screw and washer (8 total components in side package). Screw holds washer and disc on shank. 1/8" Shank with Phillips head screw and washer in threaded shank end. High Quality Nickel Bonded Diamonds on cutting disc. RPM up to 20,000 Maximum For Use in Tight Places and for Flush Cutting Cut wood, glass, plastic, metal, marble, masonry, stone, concrete and fiberglass.