After leaning against wall, the height of cutter is adjusted according to the height of wall joint, and you can from the part that need to be cut. With the scale, you can adjust it more accurately to what you need. Recommendations for use: Apply maskings tape to surface The thickened cutter is easy to remove and replace. It wear-resistants Perfect for those who require precise line marking, including constructions worker, woodworking enthusiasts, and renovations expert Achieve accurate marking with our accurate scriber tool, perfect for professional in various field The most adjust distance against wall is 7cm/2.76inch to meet most usage need. Rotates the length as need, and adjust the distance between the scriber and the wood according to the actual partition distance, Manufacturer: XIAOQENAN