Neurosurgical procedure in supine position, using ‘M’ type face Head Rest Neurosurgical procedure in supine position, using Sugita Head Clamp Neurosurgical procedure in supine position, using 3 Pin Skull Clamp Head Rest Neurosurgical procedure in supine position, using 3 Pin Skull Clamp Neurosurgical procedure in sitting position, using ‘M’ type face Head Rest Neurosurgical procedure in sitting position, using Sugita Head Clamp Neurosurgical procedure in prone position, using Prone position Head Rest