5 Straight blades, polished cutters decrease shearing Stress, promoting condition of cuttings immigration，and increasing ROP.
　　Non-plat cutting face of cutters can absorb large loads stress and prolong the fracture & wears of cutters.
　　Maximum areas of junk slot clean bit effectively，inclination of nozzles promote  hydraulic power of bit ,and perfect to increase ROP.
　　Can be driven by rotary table and down hole motor.
　　Suitable for soft-medium hard formation. High ratio hydraulic horse  recommended