SCCR (Siegfried's Call Cushion Rim): 17.5mm -18.50mm, 3.99mm - Wide oval, wide front to back
SCTR (Siegfried's Call Thin Rim): 17.25-18.5mm, 3.70mm - Oval, medium front to back
SCUTR (Siegfried's Call Ultra Thin Rim): 17.25-18.5mm, 3.58mm - Slightly oval, narrow front to back
 
 
 
 
Sizes are available in .25mm increments. The threads are 3/4 x 36 Giardinelli standard threads, with a junction point of .660" (16.764mm). The rims are designed to work well with older Giardinelli, Schilke 2-piece, Moosewood, Osmun, and Houser cups, as well as others with the same threading
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