I've been at this honing thing a few years now. you know lapping with dmts atomas etc. Which are costly. So as many of u know about the uses of sic powder for lapping.i just wanted to sing praise for the use of them and the economics behind using them. When using them with tile marble granite or flat porcelain tile there fantastic.The working area is huge and there speed is just fantastic. A lil goes along way.. i lapped all my hones in about a half hour.And my hones just don't sit on the shelf!! If anyone is considering there use i would highly recommended them. These powders are readily available on eBay and amazon.