Vintage Miniature Stepped Hollow Metal Pin Sleeves – Unidentified DNR 21-05-002 – 10 Pack

Vintage lot of 10 miniature stepped cylindrical metal components from an older electronic parts collection. These small silver-gray pieces feature a narrower cylindrical section and a wider hollow body with a visible opening at one end.

The components resemble miniature connector sleeves, socket inserts, mounting bushings, or specialized metal pins. Their exact application has not been identified, and no electrical function or specific equipment compatibility is claimed.

The original storage bag is handwritten with "DNR," "21-05-002," and "10." These markings may represent a supplier, internal inventory designation, or original part identification, but none has been verified as a manufacturer or OEM part number.

Sold as one assorted vintage identification lot containing 10 pieces of the same general style.

LIFECYCLE: NOT VERIFIED

HISTORICAL BACKGROUND:
These components came from a collection believed to contain electronic parts dating to approximately the 1970s. Their precise manufacturing date, manufacturer, original application, and material composition remain unverified. Small stepped metal sleeves and inserts have historically been used in various electrical connector and precision mechanical assemblies, but the function of these particular pieces has not been established.