Features: With its precise measurements and ergonomic design, this- tool set ensures maximum efficiency and comfort during use. The 45# steel lathe tool holder wrench/key-/inside square wrench is the perfect tool for any handyman- looking for durability and versatility. Made- of high-quality 45# steel (medium carbon steel) and treated with a black finish, this- tool set is built- to last and withstand heavy use. From repairing engines to assembling furniture, this- tool set is ideal- for wide range- of applications and can be used in both industrial and home settings. Whether you're a professional mechanic or a DIY enthusiasts, this- lathe tool holder wrench set is designed to meet your needs and exceed your expectation. Specifications: Material: 45# Steel Type: 8mm/10mm/12mm Package Includes: 1x Screw Bolt Wrench note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. The specific measurement size should be larger, otherwise the screw head can not be put into, unable to use, for example, 8MM measurement may be around 8.5MM