Made of stainless steel.
4mm inner diameter - 2 each of 4.2mm and 6.4mm lengths.
This is an indispensable product to protect the body support screws that with time and continued use can crack and finally break. With this protector tube this problem is solved and it is also possible to restore those that have been cracked or broken.
It is advisable to incorporate a protector from the first day to ensure protection over time. You can use any type of glue for plastic and metal to join both parts.