The Ideal 45-520 is a 3 blade model that is designed to offer a 1/4" shield exposure, 1/4" dielectric exposure, and 1/4" conductor exposure. Conductor exposure is variable, up to 1/2". This is primarily used in legacy RF crimp connectors. It is not used with modern day compression connectors. The third blade can be recessed to a no-cut position to allow the 45-520 to operate as a standard 2-step stripper.
If your applications require a standard 1/4" x 1/4" cable prep, we highly recommend the 45-605 PrepPRO™ for those applications. If you need the 3 step, or variable blade adjustment for unique cables or applications, then the 45-520 3-step adjustable blade stripper is for you.