150mmx 1/2" Phenolic Star Cab Polishing Grinding Laps Manufactured by Crystalite in the China.Phenolic Star Cab Polishing Grinding Laps  are used by commercial cutters worlwide and are designed to exceed the most rigid requirements.
These are special grooved , hard fibre phenolic laps that are used for final shaping and polishing of sapphire, ruby and garnet (not for faceting). The laps retain their diamond compound charge efficiently.They are 10mm (7/16") thick and are ground flat and parallel to exacting standards. The centre hole is 12.5mm (1/2").