Door lock typically used made of brass because this metal is durable and strong. It was made with a cast.
Made of stainless or carbon steel screw because it is inexpensive
Case- Anti-drill steel for strength and safety.
Deadbolt- made of brass and steel so it is substantial and doesn't wear away after time. Also so it can't easily get cut. Extruded.
Screw- made from cheap, light yet enduring metals.

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