T-Thread Extension Tubes / Spacer Rings
These spacers have male T-threads on one side, female T-threads on
the other side. Extends T-thread spacing by 5, 10, 15, 20 or 25mm.
Center opening is 38.7mm or 1.53" and the interior is grooved for
light baffling. OD is 44mm or 1.72". Black anodized aluminum,
Prices include shipping in the USA!