We are now stocking assorted Roto Window Operators. We currently have the a Roto Sash Lock, and two of there operators, a Pro Drive and X Drive Model. The Sash Lock measures 4-3/4″ tall by 3/4″ wide with a hole spacing of 3-15/16″. The lifting arm projects out 1-1/8″ with the cut out measuring 11/16″ deep. The Pro Drive Split Arm Operator has a housing that is 4-1/2″ wide and the linkage arm is 4-3/8″ long with the mounting post projecting downward. The X Drive model has hole spacing of 3-1/2″ on center on the outside holes with a 1-7/8″ hole spacing on center for the inside holes. This operator is connected to the handle with a 5/16″ hex shaft and the pin on the arm has a 1/4″ diameter.