Petz chin rest key, metal Petz screws for chin rest 4/4, thickness metal, nickel plated Item No. 3111VN 4/4 Petz screws for chin rest for … Petz screws for chin rest 4/4, thickness metal, nickel plated, with cork, 25mm × Petz screws for chin rest 4/4, thickness metal, nickel plated