... , 4" ,5" ,6" ,7" ,8" O.D.Stainless Steel Cleanout cover plate with machine screw,polished stainless steel.Countersunk hole will accept both 1/4 ... " and 5/16" screws.Face of plate cover with protective ... Plate size.: 3" , 4" ,5" ,6" ,7" ,8" O.D. Stainless Steel Cleanout cover plates Stainless Steel cover plates high quality