metal lock keyhole two parts – a cylinder and a plate a metal arm or latch that slides into the cylinder a button or lever to lock and unlock a keyhole to accept a key
deadbolt which has metal lock deadbolt which has keyhole deadbolt which has two parts – a cylinder and a plate deadbolt which is a metal arm or latch that slides into the cylinder deadbolt which is a button or lever to lock and unlock deadbolt which is a keyhole to accept a key