The B-Size Metal Gobo Holder is a sandwich-style accessory designed for ETC Source Four and Source Four Zoom fixtures. Built to accommodate standard B-size metal gobos (86 mm outer diameter, ~64.5 mm image area), it ensures the gobo remains flat during use, minimizing warping from heat exposure. The holder also functions as a heat sink, helping extend the life of stainless steel gobos in high-temperature environments. Its compact design includes a protective ring pull for safe handling near hot fixtures, and it fits securely into the gobo slot without requiring additional tools. Ideal for theatrical and event lighting, this holder supports consistent pattern projection and reliable fixture compatibility.