Features: 1. General Purpose: The 4 in 1 drill chuck key is your must-have tool for drill locking and unlocking. Lets you keep the drill firmly in place for tough jobs. Helps to hold the bit in hammer drills, also works with many other types of bits. Small key for easy storage and use. 2. CONSTRUCTION: Made of solid metal and painted with durable paint, this collet key will last through any job you can throw at it. Each side is carefully manufactured to precisely match the corresponding drill size. 3. Common areas: Ideal for handymen who need to lock the drill firmly in the drill. Perfect for home improvement needs, do-it-yourself projects, and large construction projects. Ideal for use with hammer drills when a tight fit is required. Also allows for quick drill changes. 4. Drill Size: 4 Key Sizes Included: #1, #2, #3, #4