13E202 up for sale is a lot of 10 pieces vintage stock Inner diameter grinding wheels, these can also be used for other grinding applications, these have a 1 inch OD x 0.53 to 0.56 thick just over 1/2 inch wide, the minor diameter is 0.188 3/16 inch one side is flat and one has a counter bore for the mount screw, this counter bore is 0.36 dia x 0.12 deep, the abrasive is fairly course and is a blue color we do not know the specific grade of these wheels, nice wheels for any machine shop, buyer to pay calculated shipping and packing to your locations , see our store we are adding more items each week, thank you RWK,