E-25SS-A E Style Retaining Ring,0.025 In. Thk,PK50, System of Measurement Inch, Location Style External, Thickness 0.025 in, Fits Shaft Diameter 1/4 in, For Bore Diameter Not Applicable, Fits Groove Diameter 0.21 in, Fits Groove Width 0.029 in, Fits Groove Depth 0.02 in, Free Inside Diameter 0.207 in, Free Outside Diameter 0.527 in, Clearance Diameter 0.54 in, Material Stainless Steel, Finish Plain, Material Grade/Class 18-8, Tensile Strength 120,000 psi, Ring Type E-Style Ring