Adjustable and lockable function - The tightness of the precise contour gauge can be adjusted according to your needs. It can be locked and fixed after each adjustment to ensure precise precision Both ends can be used - Designed with pulley end and pointer end, pulley end combination for drawing more fluid ; pointer end suit for precise and easy drawing Portable and Durable - Made of high quality metal & ABS, it is strong and durable. Easy to carry and store, just put it in your toolbox and take it with you anywhere Easy to use - Simple operation ie push ie draw, hand-fitted , Fix the pencil in the middle, The pencil clip can be moved up and down, pushing while drawing, which is convenient for exchanging the end of the shape complex objects. ideal for laying tiles, cutting laminates and carpets, taking ceramic molds and tools etc.