Designed to be used in place of metal wing nuts when mounting backplates on doubles, these Sonar 5/16-18 Delrin Thumbwheel Nuts are milled from a solid block of Delrin thermoplastic. Delrin is lightweight and wear-resistant, with excellent dimensional stability.
Their larger diameter makes for easier handling, the outside surface is knurled to enable easier gripping, so assembly and disassembly is a breeze. Additionally, no washer is needed, so they can be easily adjusted or removed without a tool, and they won't scratch your tanks.
Designed to fit the 5/16-18 bolts found on most brands of doubles bands, the Sonar thumbwheels are sold as a pair.