Fender string ferrules, Saitenbuchsen

string ferrules American Standard Telecaster, set of 6, chrome
Set of six string ferrules for use with American and American Standard series

string-through-body Telecaster models.
The bottom portion of these ferrules fits to a 5/16" (7.93mm) hole,

the upper stepped portion fits to a 3/8" (9.52mm) hole.