I had two of them. First one dulled the bevel I had set on a Norton 1k. This after I had lapped away HALF of the stone without finding anything smooth. I talked to the product engineer at Norton. He said I clearly had a bad one and to return it to the seller as defective. Sent it back to Amazon in exchange for a new one. Lapped away 1/8" of the 4k on it and repeated the dulling of the bevel. Sent it back to Amazon for a refund. Both stones were the 4k/8k combination stones and both had the 4k side produced in Italy. I suggest you take the Norton engineer's advice and send it back. I then bought Naniwa 5k and 8k stones, which are excellent.