Kahler guitar tremolo systems that are flat mounting use four screws to mount to the body. This is a complete set of 4.
The two longer 8371 screws mount to the front of the tremolo and the two shorter 8370 screws are for the rear. They are available individually also.
Fits all flat mounting Pro 23xx, Hybrid 7300, X-Trem 4300, Flyer 2330 guitar tremolo and 3300, 3310 and 7330 fixed bridges. These are not for fixed bass bridges or flat mount bass tremolos.