1set Pre-Wired Cigar Box Guitar Pickup With Volume&Tone Pot Jack For Acoustic Classical Guitar The distance (center to center) between pole 1 and pole 4 is 1.125 inches The distance from pole to pole (center to center) is 0.38 inches Length of the pickup housing (the part that raises and lowers) is 2.78 inches. Overall length of the mounting flange is 4.81inches Width of the mounting flange is 1.25 inches