— This is the Wen 8" variable speed bench grinder (model 4280). The speed can be adjusted from 2000 rpm to 3400 rpm. It comes with one 36-grit wheel (gray) and one 80-grit wheel (white). The wheels are 1" thick for a 5/8" arbor. A work light is built in, but you have to supply your own bulb (they recommend a 40-watt or less R20 bulb).