Abstract: A socket includes two open ends and each open end has a polygonal inner periphery. Three of the sides defining each polygonal inner periphery have a groove defined therein and two springs are received in the two open ends. Each open end has a frame received therein and contacts the spring. Each frame has three protrusions which is received in the grooves and extend radially into the open end. Each frame is retained by a retaining device. A small object can be engaged with the three protrusions in the open end, and a large object can be engaged with the polygonal inner periphery of the open end by pushing the frame and the spring.