For use with Kaiser SYSTEM-V enlargers, the Compound Negative Carrier enables the use of all negative masks and glass inserts measuring 3.9 x 2.9". Adjustable guide pins permit working with various film widths, including 61.5mm for 120 film, 41mm for 127 film, and 35mm film, and two grid pins are also used to ensure proper insert registration. Additionally, four stepless, adjustable masking strips are also featured for cropping your negative at the projection stage rather than with an easel.