Firenock "S" was the original nock style, designed in 2006. It was also the first to boast our 140 degree, four ribs system which is now known as the Shear Lock/Release System. It only weighs seven grains while the market average is 12 grains.
To fit most medium diameter carbon shafts with 0.242" - 0.246" ID
With modifications, can fit shafts with 0.240" ID - 0.250" ID.
Available in 54 colors / shades (9 nock colors x 6 LED colors)
Full system, on average, weighs only ~27 grains
Equipped with US patented Shear Lock/Release System to fit strings with a serving of 0.110" - 0.125" (ideal 0.112")
Ready for the only target lighted nock system that is IBO & ASA approved: Firenock “T” circuit
Ready for hunting and intermittent lighted nock systems that stay lit / blink for up to 21 days with a BL battery powering a Firenock “H” / “I” red circuit.
Great fit and performance with my 60X strings measuring .109. Thanks!