... are distributed in the depth of impregnated bit's matrix series.The matrix layer of the crown contains a uniform distribution ... of diamond drilling to a minimum.Size Available:Wireline Series: B,N,H,PW Series: RW,EW,AW,BW,NW,HW,PW,SW ... ,UW,ZW,HWT,PWT,BWS,NWS,HT,PT,SZMetric Series: 46 ... ,56,66,76,86,101,116,131,146X Series: RX,EX,AX,BX,NX,HX,PX,SX,UX,ZXAll ...