Flex Fletch LIT Lighted Nocks .246 Blue 3 pack 1006309. 246" inner diameter. This 3-pack of blue lighted nocks features a tool-free external on/off switch automatic activation upon release and an ultra-bright glow that lasts up to 48 hours. At just 18 grains they offer a lightweight reliable solution for locating arrows in any light condition. Specifications for Flex Fletch LIT Lighted Nocks 1006309: Manufacturer: Flex Fletch Color: Blue Additional Features: 0.246 Features of Flex Fletch LIT Lighted Nocks: Fits carbon shafts with 0.246" inner diameter Blue lighted nocks with up to 48 hours of illumination External on/off switch ? no tools required Auto-on activation when arrow is released Super bright visibility day or night Weight: 18 grains 3-pack quantity Package Contents: Flex Fletch LIT Lighted Nocks