The Hillman #6 Compression Spring is an ideal component to add in mattresses, shock absorbers and other objects that are prone to receive force acting in the opposite direction. This spring contracts when force is applied to and expands when the force is lifted. This zinc plated spring has machine cut ends and comes in 12 springs per bag.Features Zinc coated string Ability to withstand heavy pressure Specifications Outer Diameter:5/16" Wire Size:0.020" Finish:Zinc Plated Spring Number:#6 Type: Compression Spring Application: Tools and Home Improvement Length: 1-1/2" Color: Gray