【Air Hammer Spring】：M696 Air Hammer Retainer Spring Fits for Air Hammers M550DB and M668 Retainer Springs for Air Hammers 3 x 35 x 56 Mm. 【M696 air hammer】：Quick Spring Retainer for Pneumatic Hammer，easy and convenient to replace. 【air hammer spring retainer】：Fit for automotive industry, sheet metal industry, tire repair industry, construction industry, machinery factory production line and so on. 【Air Hammer Size】：Inner Diameter of Spring Coil: 28mm / 1.1in,Outer Diameter of the Spring Ring: 34.4mm / 1.4 in, Wire Diameter: 3.18mm / 0.1in. 【Sincere Service】：Pls contact us first when you get some problem, we will offer you assistance asap,all your questions and issues will be resolved within 24 hours.