The DM-4 adapter allows you to use the PAM mounting system on the DM-4 motor. This replaces the Preston rosette with the Pam size. This is only the rosette to mate the PAM D-clamp to the DM-4. This will allow you to use the D-clamps and Iris arms you currently have. What you will receive is the un-anodized part shown. The rosette can be mounted on either side of the bottom part of the motor. Anodized black.