The PQ-9016-00 is a great option to upgrade or replace the adjustable saddle on your vintage Gibson Style J-45 style acoustic guitar. It has a cutout on each end for the adjustable screw.

TUSQ nuts and saddles have rich tone without the inconsistency found in ivory, bone and other natural materials. Bone and ivory have hard and soft spots (grain) throughout each piece, hampering consistent transfer of vibrations to the guitar top. TUSQ nuts, saddles and bridge pins are designed to transfer the right frequencies more efficiently from the string to the guitar body.