Hilitchi 410 Stainless Steel Pan Head Phillips Self Drilling Screws Sheet Metal Tek Screws Assortment Kit, Modified Truss Head Self Driller - Size: #8 x 1/2" to #8 x 1-1/2 (Pack of 240)

This item was delivered very quickly and it will be ideal for the application intended.

Cheap steel. Would not tap into aluminium. The point dulled and blunted to a useless heater. Next I tried pre-drilling and inserting; screws broke in half with resistance as mentioned. I'm sure they'll work well in wood and maybe plastic?

Apart from what others have said, I would highly advice any person to purchase about 20 screw, nut, and washer assortments when you get your first residence. They have an infinite shelf life and will easily pay for themselves over time. Even if you only use 5% of the 3,000 or so fasteners over the next 30 years, they will pay for themselves in gas and time running to Home Depot at the last minute.On a related note, I have found the same to be true with purchasing quantities of small batteries (CR 2025, LR44) that go into various gadgets. They are 1/10 the cost of what a hardware store charges and have long shelf lives.

Im using this screw assortment to attach sheathing to the inside of a cargo trailer. Alhthough they are Self tapping screws, Ive found them to work most effectively if i predrill a pilot hole. The screws are light aluminum and as such the screw heads can easily fail if self tapping without a pilot hole. Otherwise they work fine.

I bought these screws so that I could screw a sign into a metal door. While i am sure that these screws could have worked as planned after quite some time, there was not much movement on the door panel. After a quick pilot hole drill, we were good to go. The screws seem solid, and the sizes are dead on. The different sizes are great.