Abstract: A support device for fitting to the end of a tubular member, such as an umbrella pole. It includes a cone-shaped body having a base and a pointed tip. An external screw-thread extends spirally on the cone-shaped body. A cylindrical connection member extends from the base of the cone-shapoed body and is adapted to be fitted into an open end of a tubular member. Two substantially flat surfaces extend from the base to the tip and define an acute angle between them and interrupt the screw-thread formation into interrupted thread sections. At least one connection recess is provided in the cylindrical member for receiving an associated projecting part extending from a tubular member, such as a lower end of an umbrella pole, for locking engagement therewith.