These are almost impossible to find and are made to replace, restore or reproduce the parts on a Gibson Banjo are these are the Hanger Bolts, known to the banjo world as "lag bolts" that are the proper size for almost all Gibson banjos made between 1927 and the flood of 2010 when the last Gibson banjo rolled off the assembly line!
These are the 10-32 thread and these are the ONLY ones that will fit a Gibson banjo from those years.
These are NOT the 10-24 (which is much easier to find and used by companies like Deering, Stelling, Stewart MacDonald and others will NOT fit a Gibson banjo unless you change the coordinator rods out... and you should never do that!
These are made of steel and are fully threaded.
I recommend that you pre-drill your hole and that these be double-nutted with two 10-32 nuts and never installed with Vice Grips. That's the way we get them installed and removed here on a daily basis in the shop.
Get these while you can!
Thank you for looking!
Richie Dotson
Acoustic Box LLC
Chesterfield, Virginia