Prevents up-ending semi-trailers when they are not connected to tractor during loading and unloading operations. Also used to level trailers parked on sloped ground and to prevent landing gear from sinking into a soft surface. Features high-strength steel construction. Flush-type zerk fitting for lubricating. ACME screw. Meets OSHA regulations when used with wheel chocks. Includes reflective collar for visibility at night. Powder coat safety Yellow finish.

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