Self-Piercing Sheet Metal Screw, Head Type Hex Washer, Hardened Steel, Finish Plain, Size #8, Length 1 In, Drive Type Slotted/Hex, Driver Size 1/4 In, Head Dia 0. 375 In, Head Height 0. 110 In, Application Combination Lead Thread Affords Quick Starting and Fast-Driving When Fastening Sheet Metal, Package Quantity 500 '
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.