T-Thread Extension Tube / Spacer Rings, 10mm, 1" and 2 long"
These spacers have male T-threads on one side, female T-threads on
the other side. Extends T-thread spacing by 10mm, 1" or 2". Center
opening is 38.7mm or 1.53" and the interrior is grooved for light
baffling. OD is 44mm or 1.72". Black anodized aluminum, M42x0.75
Prices include shipping in the USA!