These decorative thumbturns are available in all 14 architectural finishes and offered with 7900, 8200, R8200, IN120 and Passport 1000 (P1, P2, PG) mortise locks.
The thumbturn backplate will match the design of the rose chosen (i.e. E2/E3/E4 square rose ships with square cylinder collar and square thumbturn backplate) See the 8200 mortise lock catalog for more information.
