The F-ONE SERIES are the latest and most innovative trimmer heads on the market. They save time and resolve all major trimming problems in a single product. All thanks to the continual research and new technology that makes Arnetolir a leader in the field of brushcutter head technology.This head features the superb Line Shielder - Patented by Arnetoli, this stops the line from breaking at the eyelets, preventing it from going back inside the head, assuring a continuous job without interruption.Easy to fill - just unspool some fresh line from your reel - this head can take up to 12m of 2.4mm round line. Then poke the lin through the head and pull to half way. Then just twist the head and wind in the line. It turns and gives a satisfying "clunk" as it winds in. So simple, so fast. Ready to cut again in seconds.Special Features ARNETOLI Universal F-ONE 396 Professional Bump Feed Trimmer Head* Universal Bump-N-Go Line Extension Head* Line Shielder System* RC System: Easy Re-Spooling* MRA System: Incorporated Bump Knob* Spool Capacity: 12 M (Dia. 2.4 Mm Round Profile)* Suitable For Brush Cutters Of 20cc And UpBUMP KNOB NEVER BLOCKSIn the F-ONE SERIES the whole lower body acts as a bump knob, eliminating the possibility of external bump knob locking due to debris.INNOVATIVE LINE SHIELDERStops the line from breaking at the eyelets, preventing it from going back inside the head, assuring a continuous job without interruption.RC SYSTEM: EASY RE-SPOOLING1. Line up the arrows on the upper body with the eyelets.2. Insert the line into the eyelet until it comes out on the opposite side.3. Turn the top and the bottom in opposite directions to wind the line.LARGE CAPACITY SPOOLUp to 17 m of line Ø 2.4 mm round profile 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. Arnetoli Motor was founded in 1984. Thanks to Arnetolis careful and timely response to clients in a worldwide marketplace, we have revolutionized the design and manufacturing of trimmer heads andaccessories, producing innovative products for both private and commercial use, worthy of the title "Made in Italy". Awarded ISO 9001 certification in 1998, Arnetoli Motor has always guaranteed the superior qualityof both its products and services.