These are the same Battery Hold Downs that we use for the Optima Batteries that come in our Sintor Trucks. Keep your battery in place and demand the best quality. These hold downs are CNC milled here at the Sintor headquarters from billet aluminum and powdercoated in blue to protect the surface from the harsh conditions of the engine bay. This is a set of 2 (Two) hold-downs to take care of both batteries and is designed to work with Optima Batteries specifically.