Gear Head Specifications - Spline Drive: 9 splines, 1 hole. Dimensions: approx. 13cm, inner diameter of the housing: 26mm > Areas of application: livestock farming, aquaculture, agriculture, forestry, fishing. Steele, Echo, Homelite universal. High performance: Exquisite workmanship and stable performance make it the perfect trimmer accessory. The lawn mower gearbox is a great replacement for your old or damaged gearbox. Universal brush cutter gear head: This is a brand new gearbox accessory for brush cutters, trimmers, brush cutters and more. Suitable for all types of brush cutters. High quality cutting head. - Made of high quality aluminum alloy, rust-proof, corrosion-resistant and with excellent anti-oxidation properties.