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.

Malco® Zip-In Self Piercing Screw, #6 Thread, 3 in OAL, Indented Hexagonal Washer Head, 1/4 in Drive, Slotted Drive, 3/8 in L Thread, Steel, Bright Zinc-Plated

• Head will not strip out of hex driver opening
• Undercut - always seats flush
• Burr-free
• Patented head markings U.S. patent number D524638
• Sharp tapered point will not walk, mushroom or break

• Catalog https://assets.unilogcorp.com/267/ITEM/DOC/Malco_51111_Catalog.pdf