Description: The Aluminum Alloy Drywall Tool 9'' Flat Finishing Box is designed to apply the correct amount of of joint compound over taped, flat joints when used in conjunction with a box handle.The adjustable blade dial allows you to get the exact finish desired. It is the ideal size from almost all applications. How to Assemble: 1. Make sure the plat box blade is the thickness of a fingernail(1-1.5mm) above the skids. The blade can be adjusted using screws on the blade holder tooobtain the necessary height; 2. Test that the blade holder can move up and down freely; 3. Attach your plat box handle by sliding it onto the box and tightening the two wing nuts; 4. Adjust the tension on the blade holder to suit the gauge of compound which is to be used in the machine; 5. Assemble with the handle. How to Use: 1. Set the box at a slight angle from the handle and tighten the button fo fix the angle, so the headremains stationary. 2. Place the flatbox on the joint and while applying pressure, release the button allowing the box and the handle to find its own natural position. 3. Ajust the length of handle: push the button to extend the length(Max. 63.8''). Maintenance: To protect and lubricate your flat box, use a silicon spray. Do not use solvents to clean your plat box as it will damage the wiper seal and reduce performance. Regular wera parts should be replaced as needed. Specifications: Length of Flat Box: 22.5cm(8.9in) Length of Handle(Adjustable in 4 Position): 102-162cm(40-63.8in) Package Size: 106x26x17cm(41.7x10.2x6.7in) Gross Weight: 3.7kg(8.2lbs) Package List: 1 x 8.9'' Flat Box 1 x 40''-63.8'' Handle