1.high quality diamond bit 2.suitable for all kinds of strata 3.high cost effective JSA-class diamond bit to meet the demand of the domestic market practice, the use made of quality diamond products, floor work for the 5-6mm, product works excellent, high quality, suitable for all kinds of strata, a total of 11 product types, 40% of the domestic customers choose our products, and high cost performance compared to similar domestic products, matrix hardness are: <br>HRC15 ± 1, HRC18 ± 1, HRC20 ± 1, HRC25 ± 1, HRC30 ± 1, HRC32 ± 1, HRC36 ± 1, HRC39 ± 1, HRC41 ± 1, HRC43 ± 1, HRC45 ± 1

JSA level - high quality diamond bit (blue)