Malco Tools HW7X1/2ZG Zip-in Self Piercing Sheet Metal Screws, #7 x 1/2, 100 Count

Malcos 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-ins 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-ins penetrating power. A second thread above the point engages after initial penetration and drills in the screw double fast. Malcos Zip-in screws are faster driving, with a greater capacity for fastening heavier gauges of sheet metal than any other self-piercing type.

For the best performance, use any Zip-in Sheet Metal Screw with a Malco C-RHEX Cleanable, Reversible Dual-Sided Hex Driver.

• Undercut-indented hex washer slotted head
• Bright Zinc Plated
• Burr Free
• One 1/4 hex driver accommodates all sizes
• Undercut always seats flush

Combination Lead Double Thread Design

• Single starting thread machined down to very tip of screw point
• Instantly penetrates and engages in heavy gauge sheet metal and layered light gauge

Consistent Hard Point

• Quality controlled heat treat
• Sharp tapered point will not mushroom or break
• No walking