Undercut - indented hex washer slotted head
Bright zinc plated
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
Some screws sizes available in pails
Trademarked and patented head markings indicate one and only genuine zip-ins
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
https://youtu.be/s-iC8Zp8zKg