1/4"-20 18-8 Stainless Steel Coarse Thread High Crown Acorn Nuts (10 pcs.)

Inside Diameter: 1/4"
Outside Diameter 2: 1/2"
Thickness: 21/32"
Internal Thread depth: 1/2"
Material: Stainless Steel
Driver Type: 7/16" Wrench
Thread Size: 20 (Coarse)
Shape: High Crown Acorn
Hardness: 18-8
Type: Cap Nut

Box of 10.

A closed nut having a dome-like cap over the back, protruding part of the engaged screw or bolt. Also called an acorn nut.