ADJUSTABLE There is a tool in the product packaging, Adjust the appropriate tightness. | LOCKING Once object has been contoured, lock contour gauge teeth in place for perfect traces every time. | WIDEN The width of the Saker contour gauge reaches 5.9inch, while the width of the ordinary contour gauge is 3.93inch. | HIGH QUALITY Saker contour gauge is made of high quality ABS plastic and metal, high strength, rustproof and durable. |