Von Duprin 9827/9927 surface mounted vertical rod device for all types of single or double doors, UL listed for Panic Exit Hardware. Devices are ANSI A156.3 – 2001 Grade 1.The Von Duprin 9827/9927 will cover stock hollow metal doors with 86 or 161 cutouts. The 9827 device has a smooth mechanism case while the 9927 device has a grooved case. Both surface vertical rod exit devices are non-handed and built ready for extensive heavy duty applications.