The Cle-Line 0401 taper hand tap is easy to use. This item has a 1/4-20 UNC thread. Designed for right hand cut applications. In threading applications, a clearance level for the thread is known as the tap limit. In this case, the tap limit is H3. To ensure compatibility with tool, this item has a 0.255 in straight with square shank. Another important consideration is the bright finish. This taper hand tap is best used in bottoming hole; through hole applications. Comes with a 0.255 in shank. This taper hand tap is 2.5 in long and is made of high-speed steel with a bright finish. Has a 0401 configuration. The overall length measures 2.5 in. Packaged 6 per case.