• Undercut indented hex washer slotted head Burr-free Full 1/4 in (no. 8) head will not strip out of hex driver opening One 1/4 in hex driver accommodates all sizes Undercut always seats flush Single starting thread machined down to very tip of screw point Instantly penetrates and engages in heavy-gauge sheet metal and layered light gauge Quality controlled heat treat Sharp tapered point will not mushroom or break No walking

Malco® Zip-in® screws are known for their superior quality and is considered by many for being the best screw choice for HVAC metal duct fastening. A unique thread design and quality controlled manufacture spell the Zip-in® sheet metal screw difference. Zip-in® are made with a sophisticated heat treat process which 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® penetrating power. A second thread above the point engages after initial penetration and drills in the screw double fast. Malco® Zip-in® screws are faster driving, with a greater capacity for fastening heavier gauges of sheet metal than any other self-piercing type.