... on the face of the bit. Surface-Set Diamond Bits are set with a singular layer of natural or ... compound on the face of the bit. The diamond set design ensures sufficient overlap to prevent premature wear of ... the matrix. Surface-Set diamond bits are primarily recommended for use in drilling ... limitations.Size Available:Q Series: A,B,N,H,P/ATK,BTK,B3,N2,N3,NTT,H3,HTT,P3 ...