Chucks are mechanisms removably hold and/or secure a part or tool. Some chucks operate by manipulation by the operator to clamp onto and secure and/or unsecure a part or tool. For example, a conventional three jaw chuck requires the operator to loosen the jaws to insert the item to be held and to tighten the jaws to clamp down on and secure the item. Other bit holders may automatically clamp onto and secure an item when the user inserts the item into the chuck, or require an action by the operator, such as twisting the chuck body by hand or using an external device, such as a key or other tool, to secure and/or unsecure an object to be held.