Von Duprin 9975EOF4 4ft. Fire Rated Mortise Lock Exit DeviceThe Von Duprin 4ft. Fire Rated Mortise Lock Exit Device is a commercial mortise exit device with function: Mortise Lock Exit Device, exit device type: Mortise Lock Device, material: Stainless Steel, BHMA grade: Grade 1. Shared product specifications apply across available finish or configuration variants where applicable. 4ft. Fire Rated Mortise Lock Exit Device Brand: Von Duprin Product Type: Mortise Exit Device Function: Mortise Lock Exit Device