S7993 astronomical telescope M48 flange distance thickness adjustment ring with three pieces of 0.5mm, 0.8mm, and 1mm

S7993
S7993 astronomical telescope M48 flange distance thickness adjustment ring
Thickness: 0.5MM, 0.8MM, 1MM, one piece each
Usage: Fixed in front of the flat field interface.
Note that this is an aluminum alloy sheet that is extremely thin and difficult to add. Sometimes the product may have bite marks or unevenness, which will not affect its use.
All products are cut off, not stamped parts. Stamped parts have uneven horizontal surfaces with raised edges.