: Chrome steel, this wrench is resistant and ensures long lasting stability and an ergonomic design provides a comfortable grip during use for added stability and durability Tightening function: This product has a tightening function that automatically locks into place while rotating, ensuring that the screws are secured securely, improving work efficiency DOUBLE HEAD DESIGN: This wrench has both ends design and acts as an adjustable eyeglass wrench on one end as a different size tightening wrench and the other end can conveniently adjust the tightness of the glasses screws PERFECT FOR EYEGLASSES USER: Designed for eyeglass wearers, this tool is perfect for adjusting the tightness of the glasses screws, effectively solve the common problem of loose screws Wide range of uses: For professionals for repairing, assembly and work, such as electronic technicians and eyeglass repair shops, etc. Ideal for daily maintenance and repair of small appliances, such as fastening glasses and repairing small appliances, Manufacturer: LEMEIGUO