Powerful 4.4 amp motor with 12, 000 RPM no-load speed. 5/8-11 Spindle for mounting the most popular 4 in. To 4.5 in. Wheels. 2-Position side handle for right or left hand use. Resigned metal gear case dissipates heat for longer life. Spindle Lock for Quick wheel/blade changes. Also comes with replaceable motor brushes to extend tool life and Spindle wrench. Bonus pack includes: 4-1/2 in. Grinding wheel, 2- type 1 metal cut off wheels, 40, 80 and 120 grit flap discs, side handle.