ARNETOLI Spider Trimmer head - this version with both swing blades and nylon line for excellent clearing. This head is the bridge between nylon line and a metal blade.* Universal fixed line head* Same mounting procedure as a disc blade* No shaft bolt required* Can work with both nylon line and blades* Fits all brush cutters and trimmers* with 10,000 max rpmUNIVERSAL ATTACHMENTThe SPIDER heads are equipped with universal attachment. Mount using only the gear case and appropriate nut or bolt lock disc supplied with your brush cutter.WILL THIS FIT MY MACHINE?If you have a straight-shaft, petrol brushcutter AND it is capable of taking a metal blade AND you have the Nut or Bolt that is used to hold on that metal blade, then YES it should fit. The head will use your existing nut or bolt and fit on in exactly the same way that the metal blade fits.