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Material: thick walled seamless high pressure alloy steel pipe, spiral steel strip adopts single or double lead and double way compound prestressed wound welding technology to manufacture and become. Features: light weight, fast discharge characteristics. Advantages: help anchor rod can be with a variety of coal drill, pneumatic drill or help anchor drilling machine supporting the use, in the drilling and measuring for the anchor or anchor holes drilling speed, with very high performance advantages. Mining blasting effect is good, high rate of lump coal.
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