The insert shape is designed according to the shape of the duck head and the edge of rim, easy to use
This head Fits on Coats machines with a tapered hole on the end of the plunger shaft that the head attaches to.
This plastic head fits Coats Models 5030 5040 5050 5060 5065 6050 6060 6065 7050 7055 7060 7065 7660 7665 all base line models may fit others as well.
It prevents wheels from scratching and damaging when clamping wheels from inside clamps