KNOCKOUT SEAL 1/2" 100PK *Brand Name: Sigma Engineered Solutions *Sub Brand: ProConnex *Shape: Round *Material: Zinc-Plated Steel *Height: 0.30 in. *Width: 0.91 in. *Product Type: Knockout Seal *Application: Closure of Unused Box Outlets *Depth: 1.07 in. *Color: Silver *Number in Package: 100 pc. *Trade Size: 1/2 in. *Discovery ACC, CON, NBR, SUP, EXP