The Norton1601H-689 Door Closer With Hold Open Sprayed Silver Alum, 1601-H Commercial Surface Mounted Door Closer With a Friction Arm Hold Open Arm, Regular Arm, Top Jamb, and Parallel Arm - Multi-Size 1 thru 6 Hold Open Achieved by means of friction or ball and detent/ roller. Friction hold open has a range of 90° to 180° using template location and mechanical adjustment. Ball and detent or roller hold open is effective in a range of 85° to 110°. Hold open arm door closers are not permitted to be used on fire door assemblies. Norton 1601H Hold Open Door Closer For Use In High Traffic Area s In All Type s Of Institutions, Hotels, Factories, Healthcare, Ect. Norton Norton 1601H-689 Sprayed Silver Alum Door Closers Are Manufactures Of Quality Made Commercial Door Hardware.