A unique thread design and quality controlled manufacture spell the Zip-In® difference. Zip-In's® sophisticated heat treat process allows the screw to taper to a fine, sharp point without sacrificing critical point strength. A single starting thread is formed down to the very tip of the point and is the source of Zip-In's® penetrating power. A second thread above the point engages after initial penetration and drills in the screw double fast. Zip-In® screws are faster driving, with a greater capacity for fastening heavier gauges of sheet metal than any other self-piercing type.
Features:
- Undercut-indented hex washer slotted head
- Bright Zinc Plated
- Burr Free
- Full 1/4" (no. 8) head will not strip out of hex driver opening
- One 1/4" hex driver accommodates all sizes
- Undercut - always seats flush