The YakAttack MightyBolt is designed to fit perfectly into the the YakAttack Gear Trac and Gear Trac GT90 mounting rails. When coupled with the YakAttack MightyBolt Threaded Knob, you can easily attach your favorite accessories to the YakAttack Gear Trac and Gear Trac GT90. Length: 1.5 in / 3.81 cm, Material: Stainless steel, Made in: USA