Check the listing for details. Barefoot International B107 Boom Height Adjuster. Condition: New. Listed at 190.59 USD. Product # B107Boom Height Adjuster DESCRIPTIONBoom Height Adjuster (B107):Just like our booms, our boom accessories are made from high quality aircraft grade materials to provide industry leading safety and reliability. The Height Adjuster is designed with quick release pins to make usage quick and easy. Simply pin the square end of the adjuster into the boom clamp just like you would the regular boom end. Then, insert the boom end into the desired hole on the adjuster to raise and lower the user end of the boom up to 12” either direction making the boom much easier to use for riders of various heights.Tech Specs and Summary:Made from aircraft grade aluminumOnly compatible with pylon mounted boomsChanges boom height up to 12” in either directionRegularly apply clear silicone grease to the quick release pins to keep them working properlyComes with 1 ½” quick release pin needed for use2” x 2 ¼” x 13”