I've not long purchased a chineese 12k of ebay seller not full size 6 x 2 . I must ay after a good lapping when in use feel exallant. i have yellow coticule and use for finishing etc. I'm going to use straighr after my coti to finish on hoping it could sqeez a bit more sharpness and smoothness out of my razors any one tryed this and if so does it work.I will try my self but befor i do just like to hear from them that have tryed more than a thew times.