Corbin Russwin MT3 | Sargent T3 Thumbturn Specifications 1-1/2" (38mm) Thumbturn Specifications: CORBIN RUSSWIN MT3 ThumbturnSARGENT T3 Thumbturn You may also like Corbin Russwin MT1 | Sargent T1 Corbin Russwin MT2 | Sargent T2