Arbor Shim Low Carbon Steel Full Hard Temper Thickness 0.015 In Thickness 0.381mm Thickness Tolerance +/-0.001 In Inside Dia 3/8 In ID Tolerance +0.011 In Outside Dia 5/8 In OD Tolerance +/-0.002 In Tensile Strength 80 000 PSI Rockwell Hardness B90 Meets AISI 1008-1010 Package 10