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Snap Ring External 5/16" Stainless Steel pack of 100 pcs is a must-have for any mechanic or DIY enthusiast. Made with high-quality stainless steel. Item thickness of 0.025" , free diameter of 0.281". For groove diameter of 0.29" , groove depth 0.011" and hardness of HRC 42 ÷ 52 plain finish. Model number is SH-31 SS.