... spring,sofa spring,seat spring,no sag spring,belong to sofa part. metal spring clip (Sofa parts), zigzag spring,no sag spring ... ,sofa spring,seat spring,back spring belong to sofa part or sofa fittingspringFeactures:(1) metal spring clip No.4870 (used with Zigzag ... or cut to length,if required. 4).Load: up to 80kg tensile strength per clip 5).soundless under strain 6).Stapling on wood and metal ...