These are Acorn Nut Screws. They are also referred to as "Luke Rivets" for knife handles. This version is 0.250 inch diameter with brass heads.
Acorn Nut Fasteners with Step Drill Combo Kit - (.312 HD x 8-32 US x 1 L) - Brass
Loveless-Style Fasteners - For Knife Handles - (.250 HD x 6-32 US x 1.15 L) - Nickel Silver/Stainless
This is an Acorn Nut Fastener & step drill combo kit. It features 10 Acorn Nut Fasteners in the material and size specified below with the
Acorn Nut Fasteners with Step Drill Combo Kit - (.250HD x 8-32US x 1L) - Brass
Mardatt 100Pcs 7 Sizes Hex Acorn Cap Nuts Assortment Kit M3 M4 M5 M6 M8 M10 M12 Nylon Female Thread Bolt Cover Cap Dome Nuts for Protection, Indoor and Outdoor: : Industrial
View All Knife Making Supplies and Products
Rivet Nut, LOKMAN 50 Pieces 3/8-16UNC Carbon Steel Flat Head Rivnut Threaded Insert Nut, Knurled Body (3/8''-16) : Industrial & Scientific
200 Pcs Nylon Acorn Nut, 7 Sizes M3 M4 M5 M6 M8 M10 M12 Black Dome Bolt Nut Hexagon Protection Cap Cover with Storage Box, Assortment Plastic Nut Kits for Bolts Screw
View The Latest Knife Making Products
Mardatt 100Pcs 7 Sizes Hex Acorn Cap Nuts Assortment Kit M3 M4 M5 M6 M8 M10 M12 Nylon Female Thread Bolt Cover Cap Dome Nuts for Protection, Indoor and Outdoor: : Industrial & Scientific
Acorn Cap Nuts – BCP Fasteners
Acorn Nut Fasteners - Luke Rivets for Handles - (.250 HD x 8-32 US x 1 L) - Stainless Steel - (10 Pk)
Cap Nut - Satin Nickel
Loveless-Style Fasteners with Step Drill Combo Kit - (.312HD x 8