Zirc Microban 12 Hole Steri-Bur Guards lock open or closed for processing. Made of friction-activated Microban, an EPA registered antimicrobial plastic additive that helps control surface bacteria, mold and fungi continuously up to five years. Steam and chemical autoclavable up to 275°F. Adjustable for two bur lengths and complete with snap-on clip to retain two shorter burs. Hold 12 FG burs. Available in beige, blue, coral, green, grey, mauve, teal, white and yellow.