1. This universal self-tightening wrench features a dual-head design that covers a wide range of sizes from 8-24mm (5/16-inch to 7/8-inch). One end handles smaller nuts (8-13mm), while the other end fits larger fasteners (14-22mm). This single, lightweight tool effortlessly replaces a whole drawer of traditional heavy spanners. 2. Designed with a unique sharp tooth profile and multi-groove engagement, our spanner grips tightly on various shapes of nuts and bolts without slipping. It evenly distributes pressure to protect the corners of fasteners and bolt threads from getting stripped or damaged, ensuring a smoother, safer repair experience. 3. Constructed entirely from high-quality Chrome Vanadium (Cr-V) steel, the tool is forged and high-frequency quenched to ensure exceptional hardness, high torque, and superior toughness. Aesthetically pleasing and wear-resistant, it is also highly resistant to rust, enabling it to effortlessly withstand a wide range of damp or harsh working environments. 4. Featuring an elongated mechanics-friendly handle (230mm length), this wrench maximizes leverage to help you apply higher torque with significantly less effort. The smooth, rounded edge finish offers a comfortable, non-slip grip that reduces hand fatigue during extended repair jobs. 5. An essential hand tool for both professional mechanics and home DIYers. Highly versatile for automotive maintenance, motorcycle and bicycle repair, household plumbing fixes, mechanical engineering, and garden furniture assembly. Suitable for hex nuts, pipe fasteners, octagonal screws, and irregular fittings. Specification: Package Weight One Package Weight 0.15kgs / 0.34lb One Package Size 26cm * 6cm * 3cm / 10.24inch * 2.36inch * 1.18inch Qty per Carton 100 Carton Weight 15.80kgs / 34.83lb Carton Size 44cm * 28cm * 20cm / 17.32inch * 11.02inch * 7.87inch Loading Container 20GP: 1082 cartons * 100 pcs = 108200 pcs 40HQ: 2512 cartons * 100 pcs = 251200 pcs