Abstract: A system is described for connecting a working tool (e.g. a bucket, compactor tool, chisel, etc.) to the outer end of a working arm of a machine. The system includes a pair of spaced-apart upstanding flanges secured to the upper surface of the tool. Each flange includes an elongated slot. A pair of inserts sized to fit in the elongated slots are detachably secured to the flanges. Each insert includes a pair of transverse openings to receive the pins which are used for attaching the tool to the machine. The system enables any tool to be connected to the end of a working arm of any machine.