Bosch Bottoming Taps are ideal for cutting right-hand internal threads. They have 1-1/2 threads chamfered for tapping to the bottom of a hole. They have chamfered threads at the tip that are enough to start the hole and taps all the way to the bottom. Made from heat-treated carbon steel, they are rust- and tarnish-resistant tools that work equally well in plastic drilling applications. The rolled threads are more accurate and cleaner than machined threads. They are tooled to the most exacting specifications to ensure that bolts anchor securely. Laser-etched marking ensures size identification and won't wear off. They feature a precise flute design to ensure fast and easy chip clearance.