This Wrench works with all shapes of nuts or bolts.Compatible with all types of bolts and nuts. The key size can be extended from 9 to 45 mm.Ergonomic design, convenient for working in tight spacesThe red part of the key is made of rubber, so it prevents the key from falling.EASY TO USE: No more guessing about bolt or pipe sizes, fully adjustable with one-handed pressure. Coverage Area: Instantly adheres to pipes and fittings 9-45mm.