Elevate your archery experience with the Nockturnal Shift FIT lighted nocks, designed to redefine the standards of reliability and user-friendliness in lighted nocks. Featuring a bowstring-activated linear switch, these nocks illuminate ultra-bright LEDs with a simple slide of the external on/off switch, allowing for effortless operation. Constructed from super strong, clear polycarbonate that&';s both impact-resistant and durable, these nocks are built to withstand the rigors of use in any environment. They fit .166 ID arrows and come in a pack of three with universal FIT collars.