Support Luo drill it by head, and drill body and the drill handle composition, head including head outside round, and sank cut edged, and main cutting edged and screw pointed, head outside round of diameter slightly is greater than drill body of diameter, sank cut edged is located in head outside round of front-end, main cutting edged is located in screw pointed of roots and and drill axis vertical, screw pointed is located in drill of front-end, its shape for a right spin tapered, thus makes this practical new has structure design reasonable, and drill cut smooth brisk, and using efficiency high, and drill Hou hole wall flat and row chip unobstructed, advantages.

] place an order.