Description: 100% Brand new and high quality. Precision spanner wrench, for professionals and hobbyists demanding ease of operation and high quality work results. For ER Lathe Clamping Nut, Clamping Nut CNC Milling Lathe Collet Chuck, spring clamping nut CNC tool holder, fits for most tool holders. High-quality high carbon steel, harden, wearproof, and durable, perfect for equipment installation, debugging, maintain and overhaul working. If the nut diameter is within the limits of wrench specification range, the wrench in the size is suitable. Specification: Material: High Carbon Steel Color: Black Model and Size (Overall Length x Open x Thickness): 38-42: 167x33x5.35mm/ 6.57x1.30x0.21 inch 45-52: 190x42x7.88mm/ 7.48x1.65x0.31 inch Package Includes: 2 Pieces of Wrench Note: Please allow slim measuring error due to manual measurement, make sure you do not mind before you bid. The colors may be different for the different display, please understand.