Be well prepared next time you go fishing with a Promar(R) Stainless Bait Pin. Anglers use this pin for attaching carcasses or whole bait to crab rings, hoop nets, and crab traps. It measures at a length of 4.5 inches. FEATURES: Used for attaching carcasses or whole bait to crab rings, hoop nets, and crab traps Length: 4 1/2 in.