BTH-1 has 17/64" cored hole 1" deep from small end and 1/2" diameter counterbore extending from large end to meet small hole. Used for revolving handle. All others have threaded brass insert.
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Ayesha M.
The product exactly matches the description. Very satisfied with my purchase.
5 days ago
Anjali K.
The product quality is outstanding. Exactly what I needed for my work.
