'Internal Retaining Ring, Carbon Steel, Black Phosphate, For Bore Dia 30mm, Free OD 32.10mm, Thickness 1.20mm, Thickness Tolerance -0.060mm, Fits Groove Dia 31.40mm, Groove Dia Tolerance +0.25mm, Fits Groove Width 1.30mm, Fits Groove Depth 0.70mm, Hole Dia 2.00mm, Meets DIN472, Rockwell Hardness RC47-54, Tensile Strength 150, 000 PSI, Package 25'