The YakAttack Fullback GT90 Backing Plate 4" makes installation of the 4" GT90 easier and more secure by providing more surface area support inside the hull.
Specs:
- Dimensions: 4"L X 1/2"W X 1/4"H
- Weight: ~1 oz
- Construction: Aluminum, Military Grade Hard Anodized
- Included: Single 4" Backing Plate for GT90