This adapter has a 2" filter male thread (M48x0.75) as well as a T / T2 female thread (M42x0.75) on one side. It has an SCT female thread (2"x24TPI) on the other side. So this adapter can be used as (i) an SCT female to T / T2 female adapter, or as (ii) an SCT female to M48 male adapter.
Total thickness = 5.5mm (0.22"); length of SCT female thread = 1.5mm (0.06"); length of M48 male thread = 1.7mm (0.07"); length of T / T2 female thread = 2.5mm (0.1"); maximum outside diameter = 55mm (2.17"). Made of black anodized aluminum.Blue Fireball part number: T-09