BladesUSA - Samurai Twin Ninja Swords - Set of 2 lightweight Q: What is the hook

Q: What is the hook on the back of the handle for

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Handle Length: 4"

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BladesUSA - Samurai Twin Ninja Swords - Set of 2 lightweight Q: What is the hookProduct description This Twin Ninja Sword Set features 20 inch 3CR13 stainless steel green color blades with a tanto point design providing functional edge strength. Each blade is full tang meaning the steel extends through the handle for durability. The blades are decorated with Japanese inscriptions for design. It's black nylon wrapped handles provide secure grip. The semi circle hilts provide the two swords to be held together for combine use. It