Keaup lighted nocks versatile compatibility fit arrows with .204, .233, .244, and .246 inches, with H, S, and GT bushings make X/5.2mm Lighted Nock compatible with a wide range of arrows Keaup led nocks are durable and long-lasting, made of high-quality materials to ensure that your arrows are always ready for action External on/off switch design. The external switch enables you to pre-activate the lighted nock, effectively eliminating the risk of failure associated with pin-trigger activation Improved visibility during low-light conditions With 6PCS included in the pack. Easy installation and a perfect addition to any archery setup Upgrade your archery game with KEAUP X Lighted Nocks. These versatile nocks are compatible with .204, .233, .244, and .246 shaft sizes, making them easy to install on a wide range of arrows.