Time-Shaver BT10 Bumper Thing - User Friendly - No chains or sharp brackets to pinch or poke. Heavy Duty Steel Construction. Four Wheel Swivel Casters - For easy positioning in the spray booth. Roll parts into the best light and direct over-spray away from other painted parts. Wide 1-1/4" wheels will not fall into spray booth floor grates. Gas Spring Counterbalance - Adds lift and dampens motion for safe and easy rotation of parts.