Spro Power Swivels Tiny. Stainless and brass. Stronger than they look. Spro Power Swivels are tiny in size, big on strength — built from stainless steel and brass to handle the corrosion saltwater throws at them and the pressure big fish put on them. Available in a wide range of test strengths from 50 lb (size 8) up to 230 lb (size 2), with 10-pack and 50-pack options to keep your tackle box and rigging station stocked. Key Features High-strength stainless steel and brass construction Tiny size for low-profile presentations Available in 50 lb to 230 lb test range 10-packs for trip-by-trip rigging, 50-packs for ongoing rebuild work Holds up to saltwater corrosion across multiple seasons Specs Construction Stainless steel + brass Sizes (10-pack) #2 (230#), #4 (130#), #5 (120#), #6 (80#), #7 (75#), #8 (50#) Sizes (50-pack) #2, #4, #5, #6, #8 Use Surfcasting, light tackle, leader-to-mainline connections Rigging & Use Sizes 4 and 2: most popular for surfcasting and inshore work Sizes 6, 7, 8: better suited to light tackle when finesse presentations matter; can be tricky to tie heavy mono or fluoro to the smaller sizes Use as a leader-to-mainline connection that prevents line twist on lures with built-in spin 50-packs make sense for plug bag rebuilders and anyone running a lot of fluorocarbon leaders Why We Like It Spro is the standard for compact saltwater swivels. The strength-per-size is the best in the category — a tiny Spro size 6 will outpull a swivel three times its diameter from most other brands. We use them on practically every leader we tie, and the 50-packs make sense once you realize how many you go through in a season of fluorocarbon leader work.