Allin4piece C hook wrench set Four sizes compatible with 42, APU16, ER32, and ER40 nuts to cover diverse tasks and common applications carbon steel construction for durability and wear resistance in demanding environments Nonslip rubber handle with an ergonomic grip to maximize comfort and reduce hand fatigue during extended use Quick identification feature with each wrench uniquely numbered for fast tool selection and improved workflow Benefits at a glance: reliable performance, broad compatibility, durable materials, comfortable handling, and efficient operation Practical use scenarios Servicing industrial equipment or machinery that uses 42, APU16, ER32, or ER40 nuts, where quick tool recognition speeds up the job Assembly or maintenance tasks in workshops with limited access, requiring a compact, easytoidentify wrench set Routine tightening or loosening of C hook nuts in manufacturing or work, benefiting from the durable build and secure grip