Lens Spacer, 1.0 in. Diameter, 4.0 mm Thick, Aluminum, 6-pack

LT10-SP4-PK is a set of six black anodized aluminum rings sized to fit into LT10 and LH-1A 1-in. lens mounts. Much more efficient and effective than using retaining rings for spacing lenses, they are ideally suited for making fixed multi-element lens assemblies like collimators and beam expanders. These spacers are 4-mm thick and have a thin-wall design to maintain a 90% clear aperture. LT10-SP series spacers are also avaialble in six additional thicknesses from 0.5 to 25 mm. Note that the LT10-SP05-PK 0.5-mm thick spacers are made from black Delrin (acetal plastic) and can also be used as protective washers.