These are old stock steel tubular rivets with a tube diameter of 1/8" and head diameter = 3/8". Available in length 5/8" or 9/16" only.
Tubular Rivets
tubular rivets products for sale
Large Flange Blind Rivets, Dome Head Blind Rivets
Types of Rivets: Working Process, Uses, and Materials - WayKen
Removable Plastic Rivets
tubular rivets products for sale
Quality plastic hollow rivet For DIY And Industrial Repairs
Tubular Rivets for Biothane Collars
Black Steel Tubular or Hollow Post Rivets, Brettuns Village
10/50pcs M2 M2.5 M3 M4 M5 M6 GB873 Aluminum Round Flat Button Truss Head Half Semi Hollow Rivet Diameter 2mm 3mm 4mm 5mm 6mm - AliExpress
Semi Tubular Rivets Shop Semi-Tubular Rivet Fasteners Online - Bay Supply
Hollow rivet