'Arbor Shim, Low Carbon Steel, Full Hard Temper, Thickness 0.031 In, Thickness 0.787mm, Thickness Tolerance +/-0.0015 In, Inside Dia 1/2 In, ID Tolerance +0.011 In, Outside Dia 3/4 In, OD Tolerance +/-0.002 In, Tensile Strength 80, 000 PSI, Rockwell Hardness B90, Meets AISI 1008-1010, Package 10'