The MotorGuide Mounting Isolators absorb shock and protect electronics. Ideal for mounting all marine accessories, electronics and trolling motors without having to get under the deck or behind the console. The rubber limits vibration and provides a solid installation. Each rubber isolator has a molded nut inside the small end, that when tightened up against the underside of the deck by the stainless steel bolt forms a rubber mushroom shape that hold the mount in place. Each kit comes with 4 stainless steel bolts and 4 rubber isolators along with mounting instructions.