***Shim Advantage 1.international standards 2.choose high quality material and advanced thermal treatment equipments and technology. 3.adopt high-precision optical ruler to control lapping dimension, precision dimension within 0.002mm. 4.adopt high-precision double-sided lapping machine to ensure parallelism within 0.002mm. 5.adopt one-time forming process to ensure shim axiality. 6.multi-channel ultrasonic cleaning