... sizes od diamond bit PDC drill bit 1) Sealed rolling bearing, cylindrical roller cone body placed in the groove, increasing the ... Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, ... 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, ... blades)5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2, ... 22, 24,26M223,M322,M316,M222,M416,M122 12-1/4"GD1606 diamond ...