Bur Block Magnetic 14 Hole Fits FG, RA and HP bur styles Magnetic base holds burs securely and has non-slip feet for stability Drain holes are on the bottom of the bur blocks to help prevent rusting on the burs Covers are available. Covers to be ordered separately Dimensions: 2-15/16" x 1-1/2" x 1/2" Autoclavable up to 136°C/275°F Washer-disinfect Contains Antimicrobial Additive