Product Details:

Designed for the "All Glass" Look
For Use with 3/8" or 1/2" (10 or 12 mm) Tempered
Glass
Made of 316 Alloy Stainless Steel and Available in Brushed
Stainless and Polished Stainless Finishes
The CRL Swivel Head Fitting also employs our
special Combination Glass Attachment design so it can be used for
'flush' mounting for a smooth exterior surface when the glass is
fabricated with a countersunk hole. This same Fitting can be used
for the 'cap' type of mounting when using the supplied adaptor
washer. This requires just a standard hole in the glass.
Important Note:
Do Not Use With Annealed or Raw Glass