For the professional repair technician. These plastic lifters sit inside the tone holes, allowing the technician to lift low spots and achieve level tone holes for more consistent pad seal. Especially useful on rolled tone holes, and even pushed-in key guard feet and posts. Unlike traditional steel models, these will not mar the brass tone hole, are available in any size, and labeled with size.
Tone Hole Lifter
Lifters are measured by diameter of the inside half circle in milimeters