FUNCTION: Provides you with a 2.5inch OD dust port to utilize with your 2.5-inch ID dust collector hose or accessories - connecting them (stepping down) to a 1-1/4inch ID dust collection accessories without the loss of airflow or efficiency A universal non-threaded, tapered design to accommodate a wide variety of wet dry vac attachments BUILD: This adapter possesses an all-black plastic construction, and was designed for durability - to withstand the wear and tear often associated with professional workshop use and woodworking dust extraction Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! 2-1/2-Inch nominal end measures 2-29/64-Inch (2.45-Inch), O.D. and 2-7/32-Inch (2.28-Inch) I.D. 1-1/4-Inch nominal end measures 1-3/16-Inch (1.19-Inch) O.D. and 1-1/64-Inch (1.02-Inch) I.D. Connect a 1-1/4-Inch accessory to 2-1/2-Inch ID Flexible Dust Collection Hose Colour:As Shown Material:plastic Package Contents: 1 x Dust Collection Hose Reducer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.