Metric sizes. Incl. 4 hex keys (3, 4, 5, and 6mm), 2 screwdrivers, a socket driver with 8, 10, and 12mm sockets, 13 and 14mm open-end wrenches and 3 spoke wrenches. Except for the sockets all pieces are permanently attached. 3.5" (8.9cm) long, weight 10 ounce (283 gram)