·Lighted nocks fits for arrows with 4.2mm inside diameter.

·Easy to Use: Arrow nocks can go straight form the package to the shaft in fully operational condition. No assemble required, Just insert it, and you are ready to shoot.

·Battery Life of Led Nocks: Up to 48 hours and long lasting lithium batteries, makes tracking your arrows at night or daytime easy.

·High visibility - maximum light transmission, easy to find your arrow even at night or dawn, shoot it at dusk and perfect for the archers, amateurs and enthusiasts to hunting or practice.

·Package Included: 3Pcs lighted archery nocks comes, If you have any question, please don't hesitate to contact us.