optical instrument part - lighting ring
material: aluminum alloy 6063-T6
surface finish: black anodized
M28x0.75
φ 26 +0.10/-0, 25+0.100/-0, 20+0/-0.10, 19+0/-0.10, 18 +0.10/-0, 17
φ 26.80+0/-0.10, 26.40, 25+0.10/-0
φ 1.80
all non-tolerated dimensions according to DIN ISO 2768-f
weight: 2.5 gram
