RIDGID 49423 PH-60 Knockout Adapter. The RIDGID 49423 PH-60 Knockout Adapter is a new and improved adapter manufactured by RIDGID for RE-6 Electrical Tools. This Adapter is compatible with the exclusive RIDGID QuickChange System, and delivers unmatched efficiency when knocking out holes in electrical boxes. This RIDGID 49423 PH-60 Knockout Adapter is a must have for all contractors and electricians alike. This RIDGID 49423 PH-60 Knockout Adapter is compatible with knockout punch dies from RIDGID and other manufacturers. The Adapter allows users to effortlessly attach knockout punches (sold separately) and maximize efficiency and productivity on the job site. Adapter fully covered under RIDGID's lifetime warranty, giving you the peace of mind that comes with the quality of all RIDGID products.