1/4-14 x 3 Square Drive Modified Truss Head Self Drilling Screw Full Thread Zinc WFBR It has a slotted head

It has a slotted head that allows for easy driving with a screwdriver

which allows for maximum holding power

while the Phillips drive allows for easy installation with a Phillips screwdriver

and siding

These 5-40 x 3/16 Slotted Fillister Head Machine Screws are fully threaded and made of zinc-plated steel

1/4-14 x 3 Square Drive Modified Truss Head Self Drilling Screw Full Thread Zinc WFBR It has a slotted headThis 1 4 14 x 3 Square Drive Modified Truss Head Self Drilling Screw Full Thread Zinc is designed for use in metal applications. The square drive head provides a secure fit with a standard square driver bit, while the modified truss head offers a low profile and increased holding power. The self drilling tip eliminates the need for pre drilling, saving time and effort. The full thread design provides maximum holding power, and the zinc plating offers