Open end is angled 15 degrees so the wrench can be flipped over to engage fasteners twice as often in tight spaces. 12-point box end snugly fits fastener heads and resists slipping off while you work. Box end opening is designed to grip flat sides of fastener heads, not corners, to prevent round-off. Surface sandblasting, strong torque, high hardness, anti-rust, beautiful. The open end is used to quickly fasten or remove the 6 corner 12 head bolt nut. Specification: The plum blossom end is suitable for small angle operation of various bolts, suitable for narrow space operation, good torque and long service life. Material: Chrome vanadium alloy steel Size:16-18mm Length : 17.4cm/ 6.85inch Package Includes: 1 Piece Ratcheting Combination Wrench(2 Pack) Note: Please allow 1-3mm error due to manual measurement. Please make sure you do not mind before you bid. Photo color might be a little different from the actual product due to color display of different monitors. Thanks for your understanding and enjoy your shopping moment.