Features:Scope of application: double-layer membrane greenhouse for internal and external top film, single-layer film greenhouse top roll film.Cast aluminum casing: The shell is made of cast aluminum and precision die-casting, casting in one molding process.Stabilizing screws: The new gaskets are more stable and durable.Comfortable Roller: A new roller that prevents aging and smooth rollers.High-quality iron chain: It adopts high-quality iron chain, which is not easy to rust and has a longer life.Specifications:Condition:100% Brand NewMaterial: AluminumColor: As shown in the pictureSize: Approx.23*16*19cm/9.1*6.3*7.5inSpeed Ratio (refers to the gear ratio of the final drive in the axle of the car, which is equal to the angular velocity of the drive shaft than the rotational angular velocity of the axle of the upper axle, which is also equal to the ratio of their rotational speeds.): 4:1Single Net Weight: 2.1KGLarge Roll Height: 1.5 metersLarge Reel Length: 120 metersChain Length: About 3 metersService Life: More than 3 yearsPackage List:1*Manual Film Coiler