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The thumb screw is stainless steel the lock pin is made of tool steel. It is a nice little tap wrench made from drawings in Guy Lautards Bedside Machinist Reader books, and here are a few details about this product.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.