Siegfried's Call Custom French Horn RimsSCCR (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
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