A neurosurgical blade used to cut/remove circular sections of the skull vault (calvarium) to provide access to the interior, for the insertion of a catheter, a neuroscope for diagnosis or treatments such as, to alleviate intracranial pressure (ICP), obtain cerebrospinal fluid samples, inject radiopaque dyes. It may be used to make several holes for the removal of a bone flap. It is typically a hollow cylinder with a circular, saw-like serrated working edge and a centre drill for guidance. It is an exchangeable device that may be attached to a manually-rotated handle or to a powered rotary surgical handpiece. This device typically made of high-grade stainless steel. This is a reusable device.