Opening combs by hand is time-consuming and inefficient. Increase your productivity today with the Onyx HD4470 Comb Opener! The HD4470 will open comb elements from 1⁄4" to 2" and is compatible with documents up to 14" long. The HD4470's optional mounting kit allows it to mount on any vertical Rhin-O-Tuff OD or HD punch, making it an excellent investment for those looking to expand upon the functionality of their existing equipment.