Detailed Product Description This knurled wheel is hot product, the part used in Knurling machine,which is researched and made by ourselves and have owned our customer unanimous popularity. It contains SUPER-HIGH-QUALITIED ONE, whose hardness is HDA86-90, HIGH-QUALITIED ONE, whose hardness is HRC67-69, and ORDINARY ONE,whose hardness is HRC63-64. the performance of three kinds of such products ...