Rosco Gobo Holder for Steel Gobos Tweet Description The Rosco Gobo Holder for Steel Gobos is a sandwich-style steel gobo holder for size B (86mm). It fits most size B projection lens assemblies.There are hundreds to choose from; we list a few under the Accessories Tab. Details Additional Category Tags: Lenses & Gobos, Accessories for Gobos & Patterns Category: Lighting & Studio Manufacturer Catalog Number: 2.50136E+11 Product Manufacturer: Rosco Subcategory: Light Modifiers