NEW 3 pcs New FG RA Burs Holder/Bur Block Blocks Autoclavable Disinfection Holder Block Sterilizer for FG, RA, Low Speed Burs. Material: Aluminum Autoclavable under the high temperature of 135 degree and pressure of 0.22Mpa The purple one covers 18 holes (12 holes for FG bur, point for High Speed, 6 holes for RA bur, point for Low Speed) The blue one covers 24 holes (20 holes for FG bur, point for High Speed, 4 holes for RA bur, point for Low Speed) The silver one covers 24 holes (20 holes for FG bur, point for High Speed, 4 holes for RA bur, point for Low Speed)