- Material: steel,Size: 30cm*25mm
- It consists of head, drill body and drill handle.
- The head consists of the outer circle of the head, the undercutting edge, the main cutting edge and the screw tip. The diameter of the outer circle of the head is slightly larger than that of the drill body, and the undercutting edge is located at the front end of the outer circle of the head.
- The main cutting edge is located at the root of the screw tip and perpendicular to the drill axis. The screw tip is located at the front end of the drill and its shape is a right-handed cone.
- Therefore, the utility model has the advantages of reasonable structure design, smooth and light drilling, high use efficiency, smooth hole wall after drilling and smooth chip removal, etc.
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