The Gundlach Stretcher Tail Spike features a needle sharp point that bites through carpet and pad into the wood floor for a firm solid stretch. This is the replacement prong that is featured on the Single Carpet Stretcher Tail Spike and the Double Carpet Stretcher Tail Spike. This is ONLY the PRONG. Price posted is for 1 replacement prong. To be used with the Gundlach 737 and the 747.