D = 1 1/2″; 3/8″ thread.
316 grade stainless steel in Graphite Black finish.
Spacer design has a short lip/shoulder to hold glass in place for installation.
Spacer, cap, and gaskets included.
Recommended glass hole size is 3/4″ (19mm).
Imperial threaded rods and hanger bolts are sold separately.
Download the drawing here.