Countersink Angle Degrees120MaterialSteelPurposeTo counterbore and countersink holes for Briles Rivet (BACR15FV) per BAC5004-1, MS14218 - used with commercial micro stop and 3000 rpm (free speed) motorSpecificationBAC5004-1, MS14218Fastener Size5/32Used WithBACR15FVFastener TypeRivets