The Saunders/LPL interchangeable negative carrier system is a tremendous advantage for schools and facilities with a mix of models. Carriers are the professionally preferred hinged, glassless, rapid shift type. They are available in all standard formats, including one for mounted slides. A Universal glass-type carrier with adjustable masking blades is also available. Features:Saunders/LPL Medium-Format Negative Carriers are compatible with both 670 and 6700 Series Enlargers. Professional-quality, with black, anodized aluminum construction. Hinged for fastest handling.