Inline spinners are compact metal lures that produce an intense vibrating action in the water. This sinking bait is built around a metal wire that features a rotating blade, added beads for weight, and a trailing hook which is most commonly a treble. When in motion, the inline spinner's blade spins like a propeller as it swims through the water, calling out to fish. They're made in various sizes and colors and are popular among trout, panfish, and musky anglers.