If you're using an XS Power battery in your boat, you might need stud adapters to connect your boat's electrical system to the battery. These PN 589 brass adapters fit 5/16" applications found on many boats. They feature M6 threads and come with stainless steel wingnuts that are built to last. These posts work with most XS Power 12-volt deep-cycle batteries, and you can also use them with XS Power's exclusive i-BAR battery fit system. Warranty: 1 year.