Brand:GHXAMP

For 2inch:Opening Hole Diameter :18mm, length :49mm.

For 3inch:Opening Hole Diameter :26mm, length :95mm.

For 4inch:Opening Hole Diameter :35mm, length :67mm.

For 5inch 6.5inch:Opening Hole Diameter :50mm, length :140mm.

For 6inch:Opening Hole Diameter :53mm, length :100mm.

New ABS plastic,High Quality. Wrestling is not bad,

Package

2pcs ABS Speaker Inverted Tube Port Auxiliary BASS