The 3130 Ball Bearing Duolock combines a ball-bearing swivel with a Duolock clip. It maintains a swivel connection while allowing you to replace the lure without having to reattach it to the line.
The bearing follows the rotations of the connected component. The Duolock clamp allows for its replacement and is made of stainless steel.
The load capacity is 18 kg for size 10, 25 kg for size 8, 30 kg for size 6, 35 kg for size 4, and 40 kg for size 2. All sizes are packaged in sets of ten.