1. 1.1266 gland nut wrench ends have 1/4" and 5/16" diameter pinholes on the front side. The two pinhole sizes are designed to fit most hydraulic cylinders used on farms and construction equipment. 2. The opening size is adjustable by turning the nut on the top of the wrench. The 1.1266 wrench covers gland nuts from 2" to 6" in diameter, and is especially suitable for larger gland nuts. 3. Use with a 3/4" drive ratchet or breaker bar to loosen and remove gland nuts. This design helps you avoid pounding on stubborn glands and reduces the risk of hand injury. 4. Mejiao wrenches are made of high-quality steel with strong hardness. The surface is specially treated to resist rust and corrosion for long service life. 5. If you frequently deal with hard-to-handle gland nuts in work or maintenance, this wrench is a solid choice. Use scenarios: - Farm maintenance: remove or install gland nuts on hydraulic cylinders on tractors, loaders, and other farm equipment. - Construction site repair: service gland nuts on hydraulic cylinders in loaders, backhoes, and other heavy machinery. - Workshop service: handle large-diameter gland nuts on industrial or irrigation hydraulic systems with improved control and reduced hand strain.