Marching Fork for French Horn / Double Horn / Childrens Horn / Trumpet With our sturdy and practical marching fork from Soundman, you are mobile without sacrificing your notes. Ideal for marching parads, brass bands and much more. The marching fork has a 2-part clamp with sturdy spring pull for an extra good* Lyre width: 85 mm; Lyre height: 137 mm; Clamp rest width: 63 mm; Adjustable diameter *above the fixing).