Right helical knife for Welger SM 4 rotary mower Right-hand helical rotary mower blades by Stella, a leading Italian company in the manufacturing of blades for motor mowers, knives and mallets or hammers for lawn mowers. High quality right helical knife needed to replace the worn knives on your Welger SM 4 rotary mower. Remember to replace all the blades so as not to compromise the balancing of the rotary mower. Technical features: Hole diameter: 19mm Height: 90mm Width: 40mm Thickness: 3mm Helical type Original codes: 0982.15.09.00 - 0982150900 You can read all the details of the measurements of the blade in question precisely in the second image. Blade Applications: The blade for rotary mowers can be applied to Welger SM 4 rotary cutter bars._x000D_Brand Star Material Steel Production Made in Italy Applications Welger SM 4 rotary mower Original code 0982.15.09.00 Weight 0.070 kg Knife Length 90 mm Knife Width 40 mm Knife hole 19mm Knife Plate Size 90x40 mm Knife model Right helical Thickness 3 mm