Security Pin Lock for Gates. Security Pinlock (FM345) Works on All Mighty Mule models, PRO SW1500, SW2500, SW2502, SW3000/3200, SW4000XL/4200 and all Sliding gates. The GTO Access Systems - GTO PRO Pin Lock (FM345) is a substitute for the clevis pin at the front mounting point of the GTO Access Systems - GTO PRO DC series swing gate Openers and the chains of the DC slide gate Openers to hinder theft. Pin Locks are also available with matching keys for multiple gate Openers. (FM345KA)