The size range of YC series bit is 3 1/2 - 6 1/2 inch such as 3 7/8, 4 1/2, 4 3/4, 5 1/2, 5 7/8, 6, 6 1/8 and its IADC code is ******7, such as **7,**7, **7, **7, **7, **7, **7, **7,  **7.

Main structure features:

With particular structure of the coneequal worn of the compacts in permanent contact area and altemative conct area of the bit is realized.

Wear resistance of the cutting structure is enhanced by setting PDC cutters in the permanent contact area of the  cone where      the compacts are  most severely worn.

Optimized hydraulics structure improved the cleaning ability of hydraulic system on cone and bttom holeand assure higher ROP.

The bit has excellent gage protection and up reaming abilities by setting active cutting conispherical gage  compacts on head body.