Genuine OEM part, strong high quality plastic.

Works on Rigid R2401 R86044 and Ryobi P601 routers. 

Vacuum tube OD taper is 1.48in to 1.68in
ID apx 1.25in

Router not included...

To install, the base plate needs to be off or loose, remove the blank part if installed, then insert the 2 bottom angled sides of adapter first, then swing upwards until top single tab locks in.