The 5215 Dual ND Filter Wheel contains a set of neutral-density (ND) filters mounted in a single easy-to-use unit. The simple two-wheel design of the Model 5215 gives you a wide range of optical densities, from 0.08 to 3.0. Each wheel includes six 1 in. diameter filter positions. The filter positions are mechanically indexed for precise positioning and the filters are made with Inconel metallic coatings on glass substrate. These wheels are metric compatible. The filters included in wheel A are the 5230, 5235, 5240, 5241, 5242, and 5243. The filters included in wheel B are the 5230, 5231, 5232, 5233, 5234NF,and 5235.