PACKAGE INCLUDES 1 piece metal wrench suitable for outer diameter 21.5-27 mm and 1 piece plastic key suitable for M20, M22, M24, M28 water saver for taps. MATERIAL AND BUILD Forged from high quality carbon steel for high hardness, strong toughness and excellent wear resistance. Internally equipped with non-slip rubber plates to prevent rust and oxidation. ERGONOMIC DESIGN Tap key features a yellow anti-slip cover for comfortable handling and reduced fatigue during extended use. EASY TO USE AND COMPATIBILITY Key works with most aerator knobs. Hidden keys can be easily rotated and removed, while clogged or rusted tap knobs can be easily replaced. Each size is easy to handle. USE SCENARIOS - Replacing or cleaning aerator/ water saver on kitchen or bathroom taps with M20, M22, M24 or M28 sizes. - Servicing stubborn or rusted faucet knobs during home maintenance or professional plumbing tasks. - Carrying a compact kit for multiple faucets in a property, rental, or job site to quickly swap or replace aerators.