In this video, Dr. Nakatsui is carefully manually extracting grafts from the donor site in this follicular unit extraction (now known as follicular unit excision). Precision is key. Hairs grow in different angles all throughout the scalp.
As we can see in this video, Dr. Nakatsui is very carefully following the angles of the hairs when he uses his device to drill around the graft. If the exact angle is not followed, cutting through or transection of the graft will occur, therefore making the graft unusable. For more information, please visit https://drnakatsui.com/hair-transplant-procedure