Arborist-specific: Silky GunFighter Replacement Blade Features & Specs: MPN: 731-33 Blade length: 330 mm (till Ø 165 mm)TPI: Large (8.5-6 teeth per 30 mm) SPECS: Nickel coating, Blade length: 330 mm, Teeth: 8.5-6 teeth per 30 mm. Dimensions: 365 x 40 x 1.5 mm, Weight: 85 g, Kerf: 1.4 mm, Radius: 1300 Note: GunFighter blade must be kept clean to maintain its efficiency. Dissolve sap and resin in olive oil, which is an effective and environmental friendly way to maintain the blade. Limited lifetime warranty Authentic Premium Japanese Steel Arborist approved - best for live wood