HEAVY DUTY LEAD CONTACT PLATE.Dimensions: Thickness based on customer requirements.Description: Lead Contact Plate with Heavy Duty. Lead contact plates that have been copper-impregnated last ten times as long as regular lead contact plates. Dimensions: 6-5/8" (168.275mm) x 6-3/4" (171.45mm) x 1/4" (6.35mm) thick Except for A-915 and the smaller MAG Series units, fits all units.Material : Copper.