Suitable For Dendrochirurgia. Adaptable To All Petrol-driven Chainsaws Available On The Market. Arm Indications: Select The Cutter Arm Referring To The Diameter Of The Chainsaw Bar Fixing Studs. The Diameter Must Correspond To The Width Of The Slot For Fixing The Cutter Arm. Attention: To Work, The Cutter Must Be Combined With The Bell With A Pulley Suitable For The Chain Saw, Therefore Always Indicate The Type And Model Of The Chain Saw On Which To Install The Cutter.