POWERTEC 70152   Router Dust Port, 2-1/2-Inch Right-angle design for easy mounts to router and shaper tables Mount size measures 6-1/2-Inch by 2-1/2-Inch Tough, durable ABS plastic material 2-1/2-Inch Opening size measures 2-23/32-Inch O.D. and 2-15/32-Inch I.D. Connect to 2-1/2-Inch O.D. adapters or hoses