Nq /‘ N’ Series Impregnated Diamond Bit (Highperformance) Formation-Iv- Hard Formation , Nq /‘ N’ Seriesimpregnated Diamond Bit (High Performance) Formation-V-Very Hard Formation , Hq /‘ H’ Series Impregnated Diamondbit (High Performance) Formation-V- Very Hard Formation ,Nq/“ N” Series Impregnated High Performance Diamondreamer Shell Quantity: 410