Punch or trephine

a small metallic tube with the extremity as sharp as a scalpel. Applying pression with this small tube, in conjunction with a rotating movement allows the extraction of a hair "root" from the scalp. The trephine punch is also used by dermatologists to remove parts of the skin for microscopic analysis.The trephine diameter varies according to the applied technique, punch hair transplant uses a 3 to 4mm punch whereas follicular unit extraction (FUE) uses 0,8 to 1 mm trephines.