Size: 4" Long Ears,1/2" Steel Round Bar, Fits over a 1.5" Diameter Shaft. HEAVY DUTY STEEL: Heavy-duty trailer ramp springs are made of high-quality heavy-duty steel material and are forged at multiple high temperatures. The springs possess a strong and durable elasticity, ensuring long-lasting durability. HIGH TORQUE, FLEXIBLE DEFORMATION: The trailer coil springs have a torque of 2000Lb and a deflection angle of 90 degrees to make lifting and lowering your heavy-duty trailer ramp more effortless. TRAILER RAMP SPRINGS: These trailer springs are designed to help raise and lower heavy-duty trailer ramps and are ideal for truck and trailer doors. NOTE: The package includes two pairs of heavy-duty trailer coil springs with torsion springs that twist in opposite directions. If the ramp lift springs are damaged, it will shorten the service life of the springs. Timely replacement of trailer ramp torsion springs can eliminate the risk of damage due to ramp door collapse.