Hes which is a company that is part of the Assa Abloy businesses has now come out with a fire rated electric strike. The Hes 8300 electric strike is a three-hour fire rated strike that is designed to fit into most hollow metal frames with a very minimal modification to the strike cut out. It is designed to work with most cylindrical lock sets, including but not limited to Best, Corbin Russwin, Falcon, Sargent, Yale, and Schlage. The strike will work with either a 1/2 inch or 5/8 inch latch bolt. The voltage is field selectable for either 12 V DC or 24 V DC. If AC power is supplied, then a rectifier must be installed to convert to DC operation. This strike meets grade 1 standards and is UL listed. You can also use it or wood and aluminum door frame applications. Our hollow metal applications, it can often be installed without having to cut the actual frame face. It also has a vertical adjustment to allow for sagging or misalignment. It has been tested for 500,000 cycles. It also can be ordered with latch bolt monitoring. Hence also offers multiple types of faceplates and finishes.