Wider Jaw Opening: Larger jaw capacity allows 60% wider opening than traditional wrenches, supports nuts, bolts and pipes. Open: 34mm for 15cm wrench, 38mm for 20cm wrench, 50mm for 10cm wrench, 60mm for 30cm wrench. High Strength Materials: Heat treated Cr-V steel, corrosion resistant black oxide finish for durability. Comfortable grip handles are designed for durability and comfort. High Precision Laser Marking: High precision scale, allows exact adjustment of the fastener. Mirror polishing for the wrench head, makes the scale surface clearer, convenient to work. Long and Narrow Wrench: The jaw depth is 30% longer than crescent shaped wrenches. Longer jaws for better grip, thinner jaws for better access in tight spaces. Ideal for use in tight and narrow spaces to save your effort. 【Heavy Duty Adjustable Wrench Set】: Suitable for pipe/nut disassembly and assembly of various equipment, car, bicycle at home. Ideal for plumbers, electricians, automotive, gas industries and maintenance