A heavy duty compression spring is a mechanical device that is designed to resist compression and store energy. It is typically made of wire that is formed into a helical shape, and it is usually used to apply a force or to absorb a load. The size of the spring is specified by its length and diameter, and the "9 in" in the description refers to the length of the spring. The spring's strength, or the amount of force it can withstand, is determined by a variety of factors, including its material, wire size, number of coils, and the amount of force applied to it.

• Color: Silver
• Designed for heavy duty use
• Made of high quality galvanized steel
• Can be used with the carry handle or on mounting post
• 9" spring helps properly tension wire on permanent fences