Primesource Building Products, Inc.

Chih-Hsien Shen

E Erik Timothy

Tse-Kuang Jou

A screw with an improved screw head is provided. The screw may include a shank in between a head and a tip. The head may include a plurality of protrusions provided radially along the head. Each of the plurality of protrusions may include a protrusion wall, a leading wall, a trailing wall, and a bottom wall; the trailing wall may include one single trailing surface, the leading wall may include a plurality of leading surfaces, and the bottom wall may include at least one bottom surface.

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Kaohsiung, Taiwan

Chih-Hsien Shen