Description of IVY Classic 10702 Extension High Carbon
Extends any 1/4-inch round or hex shank bit an additional 12 inches, Swift Bore (Registered Trademark). Ideal for use with wood spade bits. Two set screws and hex key included. To fasten the shank in place, use the hex key to tighten these screws. High-carbon steel construction, precision ground and polished. Length: 12-inch, Shank: 1/4-inch quick-change power hex.
Extension works great with 2" blade wheels with 1/4" shaft. They center the wheels when tightening. This is to smooth the inside of the 3D printed 8" deep cylinder. Compared to the sandpaper on the dowel, the inside smooths out quickly.
Pros
Carbon steel construction, precision ground and polished
This 1.5" wing bit is ideal for drilling holes in treated wood board. After several holes, the drill does not wear out. Drills through wood cleanly enough if you place a scrap board on the underside of the piece of wood you will be drilling the holes in.
These wood bits work just as well as any spade bits I've used before. I used a cordless drill to drill a hole through an old 1" piece of 20's wood with no problem. I can't believe this drill set was discounted so low for such a quality home tool set. * The item was purchased for laying a TV cable in an old building.
Pros
Adds an extra 12" Swift Bore (Registered Trade Mark) to any 1/4" round or hex shank drill bit