Flex Fletch LIT Lighted Arrow Nocks .246 Set of 3 Green. 246" (6.2mm). Featuring an external on/off switch that requires no tools these nocks automatically light up when the arrow is shot offering superior visibility day and night. The nocks are long-lasting staying lit for up to 48 hours making them a cost-effective solution to protect your arrows. Each pack includes three lighted nocks weighing 25 grains each. Features of Flex Fletch LIT Lighted Arrow Nocks: Fits most carbon shafts with an ID of 0.246" (6.2mm) External on/off switch: no tools needed Super bright: visible day and night Long-lasting: stays lit for up to 48 hours Auto on: lights up when the arrow is shot Cost-effective: saves expensive arrows Weight: 25 grains Pack of 3 lighted nocks Package Contents: Flex Fletch LIT Lighted Arrow Nocks Flex Fletch LIT246GR12: LIT Lighted Arrow Nocks .246 Set of 3 Green