60mm x 113mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box 1pcs Springs it must be inserted into

it must be inserted into the end

Handle Opens:180 degree

smoothing rough castings

You can use this Corrugated Tube in automobile to hide all the ugly wires for installing alarm

paper feeder

60mm x 113mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box 1pcs Springs it must be inserted intoFeatures: Speaker Port Tube is used to improve the bass response of many types of speakers. There are plenty of types to help you with your vented box design, and carries tubes of every shape and size, including adjustable length ports and flared ports. These port tubes are a reliable, convenient installation, while at the same time providing a finished, "pro" look to your bass reflex speaker building project. Normal tubes suffer from nasty turbulence