1/2" #4 Nickel Grommets and Washers 1000 Package Made of Iron with Nickel Finish Hole Size After Setting = 1/2"(12mm) Flange Diameter (Top of Grommet)=0.866"(22mm) Under Flange Height=0.276"(7mm) Package includes 1000 Grommets and 1000 Washers.