Screw Packs, Cover and Frames: 9", 12" 18" Select Part Above WGX1030Z8A - Screw pack for all replacement sets Stainless steel Includes: (4) self tap and (4) machine thread WGX1031BHF2 - 9” Replacement cover and inner frame WGX1032BHF2 - 12” Replacement cover and inner frame WGX1033BHF2 - 18” Replacement cover and inner frame