- Size This C wrench is adjustable and suitable for locking nuts in the range of 3/4-2 and 2-4 3/4 inches (19-51 and 51-121 mm). The handle length is 19/11 cm (7.5/4.3 inches), the maximum opening width is 90/45 mm (3.5/1.8 inches) and the total length is 29/17 cm (11.4/6.7 inches), which provides versatility for various machine tools and mechanical devices. - Material The C key tool is made of heavy duty chrome vanadium material, a high quality material that is durable and wear resistant, ensuring long lasting performance. - Adjustable Hook Head The wrench is equipped with a movable round head and hook tensioner that allows for size adjustment and allows easy tightening or loosening of locking nuts and bearings. - Usage The pins have different sizes and are thread-like, just adjust the wrench to the desired size, place the adjustable hook or pin in one of the notches, and twist the handle to loosen or tighten the nut as needed. - Applications - Workshop tool maintenance: use for tightening or loosening locking nuts and bearings on machine tools and mechanical devices within the stated size ranges. - Automotive and bicycle maintenance: suitable for adjusting lock nuts on hubs, wheel assemblies, and other components within the ranges. - General DIY and equipment assembly: convenient for assembling or disassembling equipment with varying nut sizes and bearing housings.