Sapphire Wafer Back Grinding Wheel - Sapphire Boule Processing Cup wheel -Core Drill for Ingot -Flat surface Grinder Wheel -Sapphire Wafer Grinder Wheel Usage of the products : Sapphire Wafer - Wafer Thinning Processing Back Grinder Wheel. Grinder Wheel for LED Process: Grinder Load Reducing Design: -Wafer Damage(Down) with Efficient Wheel Blade wafer Touch Surface - Efficient Grinder heat radiation with Wheel blade cw direction diagonal model design. Sapphire Wafer friendly Wheel design-Wheel design with priority in product Quality. Wheel Life Time Easy adjusting design with priority in quality.