Dual-arbor 1in or 20mm. Push out arbor allows use on either 1 in or 20 mm arbors. Use with high speed, gas powered saws. K-T reinforced cut off wheels are resin bonded and reinforced with fiberglass to assure the highest quality and safety. Expect maximum strength from these double strength fiberglass and 5/32" thickness. Use for cutting metal shapes and solids. Wheel size 14 x 5/32 x 1IN/20MM Maximum RPM 5,200