Drywall screw (coarse thread/fine thread/hi-lo with alternative type 17):
1. Bugle head : this design provides easy countersinking in a variety of different materials and be driven flush with the materials.
2. Pan framing.
3. Trim head : allows esy countersinking. Nibs under the head help countersink the head without splitting.
4. Modi-truss (round washer head): this provides maximum bearing. surface with minimum head height.
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Taiwan
