Min hole size: 30micron
Max thickness: 1mm
Max depth-diameter ratio: 20:1
Hole precision: 5micron
Smooth sidewall, no chipping, no burs
Taper adjustable
Sapphire crystal is widely used in semiconductor
(MOCVD epitaxial GaN substrate), watches, medical science, communications,
 lasers, infrared, electronics, measuring instruments, military, 
aerospace and others high-tech industry.