These spacers are made out of strong aluminum alloy and machined flat on both sides. Adding these spacers is the simplest way of getting that extra couple m.p.h.. These spacers go between the transom and the engine's mounting bracket. In some cases they can also be installed between the jack plate and engine.
The kit comes complete with stainless steel bolts & nuts.
the set back spacers to the transom, you are moving the center of
gravity of the hull further back. By doing this you are rebalancing
the boat which allows the hull to remain at its present attitude with
less trim. Therefore, you have more power to push the boat forward
rather than to hold the bow up.