Magnetic Bit Holder Extension - 3 Piece Set - 2&rdquo;, 4&rdquo;, 6&rdquo; Extensions For Quick Change - 1/4&rdquo; Hex Shank Heavy-Duty - Screws, Nuts, Drills, Handheld Drivers, Tool Box & Construction - By Katzco MAGNETIC- Katzcos Drill bit holder extension set is made with extra strong permanent magnets to hold bits securely in place ensuring you that your bits stay in place and never wobble while in use, giving you maximum control and accuracy when drilling and driving. DURABLE- Hardened tempered tool steel with chrome-finish holders. Shock-resistant tool steel for maximum durability. These bits will stay secure and never strip or break. The Heavy-duty construction allows for long life of these extensions. CONVENIENT- Universal 1/4" quick-change hex shanks fit all power drills, 1/4" impact drivers and hand-held drivers, allowing you to bring your bit extensions anywhere to get any job done, regardless of what type of power drill or driver is at your disposal. Can fit into any tool bag. HIGH QUALITY- Katzcos Drill bit extension holder are made with a super high quality heavy duty construction to ensure maximum efficiency. The chrome finish of these drill bit holders give an added resistance to rust. 3 PACK - Katzco drill bit holders come in a pack of three(3) extension holders in 3 different sizes so you can get superior access to hard to reach screws, nuts, and fasteners. Extension lengths come in the following: 2 inch, 4 inch, and 6 inch extensions.