Taper bits 38mm 11°

The wind drill, or wind-driven rock drill, is a drilling tool that obtains its power through compressed air and is mostly found in mines, concrete, construction sites, etc. The wind drill is compact, single person can operate, the price is not very expensive, is the main force in mountain tunnels, road construction.

Different rock formations and rock drills require different cone angles. Wide cone angles are often used when drilling with high impact hydraulic rock drills in moderately hard to hard and abrasive rock formations. Modern drill rigs typically use 11 and 12 taper angles. For low impact rock drills and softer rock formations, use a narrow taper angle of 7. The 7 angle can also be used if you have problems with the bit rotation when using the 11 and 12 equipment. Also, the 4.8 angle is perfect for soft rock when using a pneumatic or hydraulic drill to prevent the bit from spinning or falling off. A single drill pipe is used to drill short holes (≤2.0m), while a drill pipe that can be connected is used to drill deeper holes (>2.0m) to avoid excessive bending stress.