The Devco PI310 Reducing Washer, reduces hole from 3/4 in. to 1/2 in., pack of 28 are for reducing knockout holes. These washers have raised flanges for a tight fit and are made of galvanized steel. This product was made by DiversiTech for the DiversiTech branded items.
Reducing washer – reduces hole from 3/4in. to 1/2in., pack of 28