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