Aluminum Alloy 9" Drywall Flat Finishing Box with Adjustable 40"- 64" Box Handle Professional Drywall ToolsSpecifications: Putty box width: 25cm/9.8in Adjustable height of the handle: 98cm~160cm/38.6~63.0in Material: aluminum alloy Blade body material: stainless steel Handle material: plasticLarge capacity box can improve efficiencyAluminum alloy material is lightweight and durableThe pressure plate cover has a wide opening for easy cleaningHow to Assemble and Use: 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 to obtain 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. 6. Set the box at a slight angle from the handle and tighten the button fo fix the angle, so the headremains stationary. 7. Place the flat box on the joint and while applying pressure, release the button allowing the box and the handle to find its own natural position. 8. Adjust the length of handle: push the button to extend the length(Max. 63.8")Package Included:1 x 8.9" Flat Box1 x 40''- 63.8" Handle