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REPLACEMENT PART NUMBER: RS16933LH RS16933RH Trailer ramp springs fit shaft 1.5 in diameter. SPRING SIZE: 4 long ears, 1/2 steel round bar, 1-5/8 +/- inner diameter. 1 x Left Trailer Coil Spring + 1 x Right Trailer Coil Spring. EASY LIFT RAMP: Trailer coil springs provide 90° of deflection and 2000lb of torque, making it easy to lower and lift heavy-duty trailer ramps. FUNCTION: Trailer ramp coil springs help support the ramp and raises or lowers it as needed, reducing manual effort and increasing operational convenience. FOR ROUND PIPE: Trailer Ramp Springs are designed for use with round pipes, not square pipes, which can cause the ramp springs to bind. ASIN B0D3GZH4GR Brand TRUCFUSION Model Trailer Ramp Spring Item Weight 5.72 pounds Manufacturer TRUCFUSION Item model number 11033123 Package Dimensions 13.39 x 5.16 x 3.74 inches Manufacturer Part Number 11033123