This is an Interfit 33" (84 cm), Translucent/Silver/Black Backing Umbrella. Silver umbrellas are used to bounce light onto a subject. They provide softening, with a harder shadow than a regular white umbrella. Light loss is usually ~1.5 f/stop compared to the same light used direct, bare light. The black backing cuts down on stray light.
Use this size umbrella for a 1 - 2 person head-and-shoulders portrait.
The Interfit STR117 Umbrella Bracket is a versatile bracket that will fit on almost any light stand. This bracket tilts and swivels to make aiming the light or flash easy. It also includes a hot shoe mount, which will accept virtually any shoe-mount flash unit (except Minolta/Sony).
This Interfit/Paterson 7.5' Light Stand is aluminum and has 4 sections, with sure-twist section locks.
If you forget to tighten any section with your light mounted, the light slowly descends, thanks to the air-cushioning of this stand. This useful feature saves equipment and fingers from harm during busy photo sessions.