Material; body support plate top plate alum.Alloy, anodised chromic grey, location plate, stainless steel, cadmium plated, shroud and screws, stainless steel except screws which should be al.Alloy anodised; 2x.118 in. Holes 100 degree countersunk to .230 in.; 2.715 in. L; 2.005 in.H; 0.692 in.W.