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Vintage Seizo Imai Seki Japan .196x.25" Thumb Stud Part for Folding Pocket Knife
$12.95
This is a set of thumb studs made in Seki, Japan by Seizo Imai for his custom knives. The dimensions of the outer portion of one side is 0.196 x 0.25". The center diameter is tapered from 0.155" to 0.45". It would work for a blade about .148 to .195"...