Works with cylindrical locksets up to a 3/4" throw latchbolt. The Grade 1, fire rated, preload solution. The 7501 series electric strike is ideal for fire-rated applications with pre-load conditions which may be caused by a warped or misaligned door, weather stripping, a smoke seal or any other condition that could cause door bind. The heavy duty stainless steel construction provides the strength and durability required to accommodate fire-rated latchbolts up to 3/4" throw.