2. Rock drill: used to drill holes with a diameter of 20 ~ 100 mm and a depth of less than 20 meters in rocks above medium and hard. According to its different power can be divided into pneumatic, internal combustion, hydraulic and electric rock drill, of which pneumatic rock drill is the most widely used.
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They are the footwear of choice when the sky opens up and the world becomes a giant waterpark without boundaries They are the footwear of choice when the sky opens up and the world becomes a giant waterpark without boundaries
The boots also typically feature reinforced toes and heels for added protection against impact and abrasion The boots also typically feature reinforced toes and heels for added protection against impact and abrasion