The three-section Manfrotto 196AB-3 Articulated Arm supports 2.2 lbs @ full extension. Extra versatility is also given by the sliding extension system which allows for easier positioning of lighting fixtures even in awkward and tight spaces.
Maximum Length is 33.5 inches, and the bottom 5/8" spigot (compatible with the optional Superclamp), also has a 1/4" thread.
Specs
Specs