The Master Mechanic Quick Change Adaptor is a versatile 12-inch woodboring extension designed to enhance your drilling capabilities. Featuring a durable 1/4-inch grooved hex shank, this adaptor is engineered for precision and ease of use. The tapered head design effectively guides the extension through the hole, ensuring a smooth drilling experience. With a recessed black sleeve, you can rest assured that accidental release is prevented, allowing for safer operation. The slim diameter chuck and extension are specifically designed to pass through an 11/16-inch hole, making it ideal for various applications.