Also used to level trailers parked on sloped ground and to prevent landing gear from sinking into a soft surface. If a loading ramp is sloped, jacks may be used to stabilize a trailer parked on the ramp. Jacks must stand on the ramp so the jacks are perpendicular to the underside of the trailer. 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. FOB Shipping Point. Due to tariffs and market conditions, pricing subject to change.