These Insulators fit over the Bar Separating Pins in your M645 Orchestral Bells. Without these, your bars will rub against the pins and cause a very distracting, unwanted buzzing noise.
Fully-functioning M645 Orchestral Bells require 36 separating pins, so if you're completely refurbishing the instrument you'll need four packs of these insulators (or you could purchase the pins that have insulators already).
