EASY JAWS: Using our patent pending Snap-Lock Technology, Easy jaws snap securely in place yet release instantly with the provided tool. 1) Release Easy Jaw with included Jaw Key. 2) Slide out existing jaw. 3) Slide in your next Easy Jaw and listen for the 'snap'! ZOOM RING: Quickly adjust your gripping diameter with just your fingertips! Use chuck key for final tightening if necessary. STRONGEST JAW DESIGN! Easy Jaws are held in place by the chuck body, not screws that are susceptible to shearing. SAFETY CORNERS: Rounded corners of the Easy Jaws reduce chance of injury or knuckles. DURABLE COMPONENTS: Easy Jaw components are hardened and corrosion resistant for extreme durability. EASY CHUCK ACCESSORIES: Comes with the only two tools you'll ever need: 1) Jaw Key: 1/8'' ball end hex driver. Used for both jaw release and spindle set screws. 2) Chuck Key: 5/16'' hex t-handle. Used for final jaw tightening.