PLATE LOCKS are an innovative, sustainable, cost effective, National Award Winning Solution to the many safety hazards associated with road plates. Using plate locks to secure your road plates will give you the positive public recognition you deserve, turning public complaints into complements. PLATE LOCKS were desinged specifically to mark, identify and secure steel road construction trench plates. Cold mix was never manufactured, designed or intended to be a road plate securing device, it just so happened that it was the only thing available at the time to get the job done. That was the past and PLATE LOCKS are the future. Continuing to use cold mix for your road plates is like digging a trench with a shovel instead of a backhoe. You can get the job done both ways but which method makes more sense? Save your cold mix for the potholes!