The ProAm Adjustable Wrench (Spanner) Shifter is brought to you by KC Tools, the undefeated name in quality and affordable professional tools. This adjustable wrench shifter has superior construction, made with chrome vanadium (Cr-V) steel. It was heat-treated to create a product that can last for several years of use even with heavy use. This ProAm wrench is strong and durable. The wide-calibre, 450mm opening means that it is suitable for almost any application. The wrench is highly adjustable, and all modification can be done smoothly. Because of its high-quality parts, you can adjust the spanner quickly and easily, so it fits the screws and nuts that you want to work with. The wrench shifter also has a laser printed scale, which allows you to measure the size of the nut or bolt right at the jaw.