For optimum performance, STIGA Autoclip robot lawn mowers must be installed following the proper procedure. This kit contains 150 metres of cable, 300 nails and 3 connectors. The cable releases a strong signal at all points of activity on the perimeter, even those furthest from the charging station, and is made of laminated copper. Its external diameter is 2.35 mm and the internal diameter is 0.75 mm. The cable is secured with nails and connectors. This kit is for use with STIGA Autoclip 200 and M series robot lawn mowers (models 221 - 223 - 225S - 228S - 230S - M3 - M5 - M7).