Premium quality 45 steel material, special treatment, high hardness, durable and good toughness. Precision spanner wrench, great for professionals and hobbyists demanding ease of operation and high quality work results. A great auxiliary tool for turning nut or , widely used for vehicle repair, machinery repair, etc. Hardness, wearproof, and durable, perfect for equipment installation, debugging, maintain and overhaul working. Easy to operate, 3 types for you, practical and convenient for use. Specification: Material: Steel Head Shape: Square Size: Capacity: 34-36mm Thickness: 5mm, Height: 3.5mm, Length: 153mm. Capacity: 38-42mm Thickness: 6mm, Height: 4mm, Length: 168mm. Capacity: 45-52mm Thickness: 6mm, Height: 4.5mm, Length: 188mm. Color: Black Quantity: 1pc 34-36mm, 1pc 38-42mm and 1pc 45-52mm, 3Pcs in total. Package Includes: 3 Pieces of Hook Wrenches Note: Pleas