SURFACE SET BITS   SURFACE SET BITS Surface set bits feature a highly wear resistant matrix, where individually selected high quality diamonds are set in a pattern optimized for varying drilling conditions. Available in 15, 20, 30 & 40 SPC. Diamonds are processed natural, AA or AAA. The diamond pattern on the crown is computer generated and machined in the mold, for accuracy and repeatability. The crown profile can be any of the following: Flat Crown, Full Crown, Semi-flat, Semi-round and stepped.  © 2011 Copyright DIAMCO . All Rights Reserved 1.800.746.0258