Palmero - Bur Block 36 Hole FG Clear PlexiglassHelps keep instruments organized Design maintains visibility of stored objects Convenient to handle Available in various hole configurations The Plexiglass Bur Block is an attractively clear, non autoclavable block that allows storage and organization of dental burs. The 36 Hole block measures 5 in x 2 in x 1 2 in, with 10 16 inch hole spacing that accommodates friction grip burs. Available in different styles and various hole configurations.