The Revival Pickups RPJB Vintage Style Alnico 5 Single Coil Pickups Set for 4-String Jazz Bass, Black. Fits most 4-string JB style electric bass, like Fender/Squier Jazz Bass or similar bass. 60's mellow bright Jazz sound, a truly authentic vintage tone that you would expect from high-end instruments. String spacing: the neck is 56mm (2-13/64 inch), the bridge is 58mm (2-9/32 inch), mounting screw holes spacing: the neck is 38mm (1-1/2 inch), the bridge is 40.5mm (1-19/32 inch). Resistance: the neck is 7.5K, the bridge is 8.5K, tolerance: 0.5K; Magnet: Alnico 5; a row of pole piece; wiring: 2P. Package includes: 2 pieces pickups and mounting accessories. Note: Our screws maybe will not fit your usage, please use your own if you can.