Petzl RIG Descender RIG but the 23" model offers

but the 23" model offers a longer 21" cutting edge vs the 20

How long can I extend the pole

manufacturer guidelines

Stirrup width: 4-7/16"

This is the correct version for you

Petzl RIG Descender RIG but the 23" model offersThe Petzl RIG is a compact, self braking descender engineered for experienced rope access technicians and arborists who work on rope every day. The ergonomic handle delivers excellent descent control, while the AUTO LOCK system allows users to position themselves at a workstation without manually operating the handle or tying off the device. A moving side plate that opens while the device remains connected to the harness makes passing intermediate