Includes 30 Nickel-Silver Humbucker Guitar Pickup Covers NICKEL Plated, 53mm Pole Spacing Manufactured from nickel silver for the most transparent sound NICKEL plated covers 53mm pole spacing, measured center to center Pole hole diameter is 5.2mm Overall dimensions are 2.75" x 1.5" x .635" (69.7mm x 38.1mm x 15.9mm) Interior dimensions are 68.1mm x 37.1mm