For making heavy duty rigs and deep sea rigs.On the case by the strong force, it can rotate flexibly.It is applicable to many different kinds of fishing, it is your good helper. structure does not make fishing line knotted, or twisted.Connector can be connected conveniently and fast, pole, sea rods, rock fishing group, fishing line, lure fishing etc.Specification:Material: metalLength 2/0: 16mm/0.63inch; Internal Diameter: 2.5 mm/0.10inch; Swivel Length: 23 mm/0.91inch; Test: 71kgLength 1/0: 22mm/0.87inch; Internal Diameter: 2 mm/0.08inch; Swivel Length: 23 mm/0.91inch; Test: 57kgLength 1: 22mm/0.87inch; Internal Diameter: 2.1 mm/0.08inch; Swivel Length: 19 mm/0.75inch; Test: 44kgLength 2: 19mm/0.75inch; Internal Diameter: 1.9 mm/0.07inch; Swivel Length: 18 mm/0.71inch; Test: 40kgLength 3: 15mm/0.59inch; Internal Diameter: 1.5 mm/0.06inch; Swivel Length: 15 mm/0.59inch; Test: 38kgLength 4: 14mm/0.55inch; Internal