Features: extended for better reach. Get in where other tools fail to go!! compact tapered gear housing with close-coupled grinding wheel reaches inside corners of as little as 30 degrees with 4″ wheel superior steel grade internal gears for longer life new 1.0 hp motor eliminates “stall” and increases reliability new spindle lock for ease of wheel change new 11 position rotational guard grinder disc sizes: 4″ (1/16 x 3/8)(1/8 x 3/8)