8066. This DORMAKABA 8066 Double Action Top Centre is suitable for timber doors and is for use with the BTS80 concealed floor spring. The complete unit includes both the frame portion with an adjustable pin, enabling it to be used for deep profiles up to 16mm, and also the door portion with needle bearing. The double action steel construction can be used with a maximum door weight of 300kg and is non handed.. Suitable for timber doors. Double action. Complete unit includes frame and door portion. Adjustable pin for deep profiles