Made of carbon steel and stainless steel.Normally with hi-lo thread /diamond point.
Machine screws made of carbon steel and stainless steel. Minimal size M1.5. Normally with pan head, button head,countersunk head. Philips/Pozi/Torx/Slot drive.
Screw+Washer(spring washer+flat washer) sets.Made of carbon steel and stainless steel.
Types:Non-standard.Nylon head screw. Hanger bolt.Nail screw...