The 18-hp propane Revolution Grinder & Polisher takes on small or large jobs with its 40-in. two-head system and massive down pressure. The 40-in. wide, low-profile grinding deck produces fast results when grinding wet or dry concrete surfaces. The Revolution Diamond Tool System offers Velcro-backed discs in a variety of metal, semi metal, and resin bond tooling options. Sawtec, a div. of MK Diamond Products Inc. 800-421-5830.