The Steel Combo Stand Extension is a single riser double sections chrome plated stand 

extension with a Triple Function Universal Head with 1/8" (28mm) and 5/8" (16mm)

 Receivers with a Multi-Direction 5/8" (16mm) Stud. The bottom of the riser section

 has a junior 1/8" (28mm) stud that will fit into a Master C Stand Base, 

Runway Base or any piece of gear with a junior 1/8" (28mm) receiver. 

It can extend the length from 138cm to 228cm.