Boss Audio 4" MR4.3B Box Speakers - Black - 200W [MR4.3B] Boat Outfitting | Trim Tabs Stud dimensions: 3/8" x 3/4"

Stud dimensions: 3/8" x 3/4"

AIS Class: Both A & B

The Straight shaft drive unit replaces the manual drive used on cable steered boats and is mounted directly behind the dash

Sea Shelter2 and Sea Shelter3 brackets

Diameter:2-7/16"

Boss Audio 4" MR4.3B Box Speakers - Black - 200W [MR4.3B] Boat Outfitting | Trim Tabs Stud dimensions: 3/8" x 3/4"4" MR4. 3B Box Speakers White 200W Whether you are at a boat party or spending a day out on the lake, you can enjoy the premium quality sound of the BOSS Audio 3 Way Marine Enclosed Speaker System. This enclosed marine speaker system features a tweeter and 1. 5" polypropylene cone. Swivel brackets are included for a smooth, simple installation process. The versatile speakers can also be installed indoors or on the patio, giving you plenty of options