Detailed Product Description Other Access Control Products Electric Bolt Lock (Low temperature)Product Description: YET-2000B auto-control ... of electric lock,12V~24V self-adapt working,with door state and lock state signal output,alarm output available with 8 wires. More safe ... Metal door, Fire Proof door Locking Bolt: the diameter of the stainless steels locking bolt is 15.2mm, stretch length is ...