The silicone plugs hold any type of bur securely. Make from stainless steel and silicone.Can be used with all known decontamination, cleaning and sterilization processes. Each stand can be rotated to offer the burs flat or at an angle. Will hold Friction Grip or Right Angle Slow Speed burs no matter their diameter. The box includes a silicone cursor on the cover for counting the number of times used. Made in France.