This is the Morifish Speargun Band Tying Wishbone Insertion Tool Bands Features: Protect your hands with the SpearPro Band Insertion tool Easily install difficult to fit metal and plastic wishbones into speargun bands Stainless Steel - Extremely durable Designed and used by professional spearfisherman 6.5mm internal diameter dimensions - Ideal for Metal, Plastic, and Large Dyneema Wishbones Protect your hands with the SpearPro Band Insertion tool. 6.5mm internal diameter dimensions - ideal for metal, plastic, and large dyneema wishbones. Easily install difficult to fit metal and plastic wishbones into speargun bands.