Product Review

• OVERVIEW： Made from high-speed steel, these combination drill and tap bits are designed to tap up to 10-gauge wood, plastic and other soft materials. They are not suitable for drill and tap in metals. These drill taps are a great time saving accessory. Each one is a combination of a twist drill bit and a tap. The point is the same as a twist drill bit, which is self-centering. So, you don't have to buy a centering drill bit or a center punch. Now you can drill and tap at the same time in one operation. No tool changes, good alignment and fast cycle times make this a very productive tool. This high-speed steel (HSS 4341) drill/tap combination bit set are offered in a set of 6 different british sizes ：1/8'' 5/32" 3/16" 1/4" 5/16" 3/8". 
• TECHNICAL DETAILS: Material: High Speed Steel 4341 Tapping Material Type: Wood, Plastic, etc. Tapping Material Thickness: About 5mm Point Type: 135 Degree Split Point Shank: 6.35mm (1/4") Quick Change Hex . 
• NOTICE: It's highly recommended that the combination drill and tap bit is used on a tapping machine. If you apply an electric hand drilling machine to do the tapping job, please pay attention to your operating, because excessive shaking and tilting may affect the result and even break the bit.