It"s your most economical insurance policy. Stays dependably in place - jumping squirrels can"t knock feeders down. Great for securing your bird feeder, plant, chime or garden art. Snap closure slides through loop to lock feeder. Locking Chain with snap close lock on 18-inch jack chain. Rust resistant plated steel. Dimensions: 1 by 1 by 18. Mounting: Loop and lock chain. Construction: Rust resistant plated steel.