General Guitar Humbucker Pickup Mounting Ring,Metal Chrome plated,USA Outside dimension: Approx. 3-5/8" x 1-13/16" ( 92mm x 46mm) Inside dimension: Approx. 2-3/4" x 1-17/32" (70mm x 39mm) Two pickup screw Holes Distance: Approx.3-1/16"( 78mm) (center to center) Mounting Hole Distance: Approx. 3-5/16" x 1-15/32" ( 84mm x 38mm) (center to center)