86mm x 91mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box 1pcs Threaded Rods & Studs Professional - Need special tools

Professional - Need special tools (like Riveter) to mounting this blind rivets

you can wrap a circle around it with paper strips or tapes

lower voltage and improper Sucked object etc

Total Size : 101mmx 18mm x 53mm/3

Compatible Model: FA2-4/IBEK

86mm x 91mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box 1pcs Threaded Rods & Studs Professional - Need special toolsFeatures: 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