Astragal moldings are common in older homes and classic furniture, including window sills, table edges, counters, picture frames, and chair rails. Carbide tipped.

CLASSIC ASTRAGAL ROUTER BITS
QUESTIONS & ANSWERS
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Which of your two bits will produce a 3/4" wide astragal moulding? Thanks, Bill
WL-1428 would be too large. WL-1427 would not give you any portion of the cove cuts at the top or bottom. The Amana bit, 51530 has a 1" cut length and should give you about 1/8" of the cove cut at each edge.
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Is this 1/2" shaft?
As noted in the description, all of the bits in this category are 1/2" shank.