This item for auction is 10 new high quality single sided brass center cutting discs. They are 3/4" (9 mm) diameter and .3 mm thick. They have a fine grit. The center hole is square and large, but works on a round screw. Selling in AS-IS condition as described above. Buyer to pay $4.00 first class mail US, out of country $15.00 first class air mail. T-216 /