The Manfrotto Camera Screw Stopper for Select Quick Release Plates is a true replacement part for 357, 357PLV, 410PL, 454, 500A, 500AH, 501PL, 504PLONG, 509PLONG, 561B, and 577 quick release plates. It secures camera screws against accidentally lost of the plate and can be removed to take out or replace camera screws in the plate.
This product can expose you to chemicals including lead, which is known to the state of California to cause cancer and birth defects or other reproductive harm.