The Gator GFW-MIC-CLMPBM16 Frameworks is an adjustable angle clamp-on mini boom. Clamp securely attaches to tube diameters ranging from 15mm - 22mm. 16" reach to end of boom. Angle adjustment clamp allows 270-degrees of rotation. Interlocking teeth securely locks boom angle. 5/8-27 male threads at boom end with jam nut