Diorio trumpet backbore (cut for Frost custom brass screw sleeves)

Description

Assorted Diorio trumpet backbores. Condition is Used. Shipped with USPS priority mail
These will fit all standard trumpet screw tops (warburton, pickett, frost, black, etc.)
All Backbores have been cut to fit Frost Custom Brass Screw Sleeves
You MUST have a Frost sleeve to use this back bore (those are sold as a separate item)
All Backbores have been refilled and redrilled to #27 hole
The following models are avaialble:
.003
H.D5
*7
41
53
DG3
Absolutely no refunds or returns for ANY reason including failure to read this details box or comprehend the English language