Plate casters install onto machinery, carts, or other equipment to allow them to roll, which reduces effort when moving or repositioning the equipment. Each caster has a flat mounting plate that distributes loads and shock forces better than stem casters. Plate casters are typically attached to equipment using bolts or screws. Swivel plate casters can rotate 360°, allowing equipment to change directions while rolling. Rigid plate casters roll in a straight line. Two rigid plate casters will often be paired with two swivel casters to allow the equipment to both maneuver around curves and obstacles and maintain a straight course while rolling.