Humminbird 740179-1 IDMK H89R Reinforced in-Dash Mounting Kit, Helix 8/9 G3 and G3N Series Fishfinders, Black HELIX 8/9 Kit Style:HELIX 8/9 Kit Material：304 Stainless Steel Thread pitch:

Material：304 Stainless Steel Thread pitch: 1

as they WILL NOT react to undiluted chlorine

Our inserts work great with soft woods and hard woods

and you can talk without the ppt button

Requires pre-drilled holes (hole should be the same diameter as the threaded post)

Humminbird 740179-1 IDMK H89R Reinforced in-Dash Mounting Kit, Helix 8/9 G3 and G3N Series Fishfinders, Black HELIX 8/9 Kit Style:HELIX 8/9 Kit Material：304 Stainless Steel Thread pitch:Humminbird 740179 1 IDMK H89R Reinforced in Dash Mounting Kit, Helix 8 9 G3 and G3N Series Fishfinders, Black Humminbird 740179 1 IDMK H89R In Dash Mount. Overview: In Dash Mounting Kit allows quick and easy, in dash installation, with all necessary mounting hardware. Compatible Fish Finders: HELIX 8 G3N Series All models, HELIX 9 G3N Series All models. Product Features Reinforced mounting kit Helix 8 and Helix 9 models Allows quick and easy in dash