Manufactured from black glass filled nylon plastic with matte finish and a
zinc-plated steel molded-in hub, the face of the boss is exactly square to the
bore and is made of steel to prevent edges from breaking.  The star knobs
are available in metric and inch sizes with a maximum heat tolerance of 110° C
(230° F).  Made in tapped or blind bore types, special bores and threads
are available upon request as are other modifications such as cross pins and
set screw holes.

J.W. Winco, Inc.
www.jwwinco.com