Slim design allows the PREPI bur to easily fit into the pulp chamber. Used for removal of the plastic obturator handle, these instruments are available in five different sizes: .50 mm .70 mm .90 mm 1.2 mm 1.5 mm assorted .70-1.5 mm The PREPI bur is also useful when making starting points for Pro-Post® drills in plastic obturator cores.