Description: Chrome vanadium steel, special heat treatment, high hardness, durable and good toughness. Precision spanner wrench, great for professionals and hobbyists demanding ease of operation and high quality work results. An ideal auxiliary tool for turning nut or bolt, widely used for vehicle repair, machinery repair, etc. Hardness, wearproof, and durable, perfect for equipment installation, debugging, maintain and overhaul working. Easy to operate, 8 types for you choose, practical and convenient for use. Specification: Material: Chrome Vanadium Steel Size: Capacity: 19-51mm (3/4''-2"): Round Head: Diameter: 4mm, Height: 5mm, Thickness: 15mm, Max Opening: 35mm, Handle Length: 125mm. Square Head: Width: 4.5mmSquare Head Thick: 4mm, Head Thickest: 15mm, Max Opening: 35mm, Handle Length: 125mm. Capacity: 32-76mm(1-1/4''-3") Round Head: Diameter: 6.3mm, Height: 6mm, Thickness: 18mm, Max Opening: 65mm, Handle Length: 155mm. Square Head: Width: 5.5mmSquare Head Thick: 4mm, Head Thickest: 15mm, Max Opening: 35mm, Handle Length: 125mm. Capacity: 51-121mm(2''-4-3/4'') Round Head: Diameter: 8mm, Height: 9mm, Thickness: 20mm, Max Opening: 85mm, Handle Length: 218mm. Square Head: Width: 7.5mmSquare Head Thick: 5mm, Head Thickest: 15mm, Max Opening: 35mm, Handle Length: 125mm. Capacity: 115-170mm(4 1/2''-6 7/10'') Diameter: 8mm, Height: 10mm, Thickness: 20mm, Max Opening: 130mm, Handle Length: 250mm. Square Head: Width: 12mmSquare Head Thick: 5mm, Head Thickest: 15mm, Max Opening: 35mm, Handle Length: 125mm. Package Includes: 1 Piece Hook 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.