Our long screen door springs are important tool in our daily life., Size: 20 Inch*0., 35 Inch(L*W) Custoized Wire Foring Extension Spring, Stainless Steel Spring Constant Coil Spring, Copression Springs by Drawings Long Tension Springs Customized Precision Stainless Steel Compression Torsion Spring Spiral Style Zinc Plating Load Steel Tension Springs ZYUNMALL 20 Inch Zinc Plated Steel Wire Extension Spring, 4 Pack: : Industrial & Scientific Length: 50 cm / 20 inches; Outer Diameter: 8 mm / 0.3 inches Material: Zinc-Plated Steel, offering high long lasting and hardness Finish: Polished for enhanced rust resistance Type: Dual Hook; Elasticity: High elasticity for reliable tension and stretch Versatile Applications Our extension springs can used in automotive, instrument, electrical equipment, household appliances, furniture, mechanical equipment, electronic sports equipment. The 5552CS has an outside diameter of 0.812 inches and a wire diameter of 0.105 inches. It has a spring rate of 20 inch-pounds, providing reliable performance Material: Our Long screen door spring are made of zinc plated steel, it is of good quality, good durability