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China R28 series drifter rods, extension rods, M/F . Products Features:. High quality and competitive price ; Suitable for Atlas Copco,Sandvik etc. Sandvik button bit ; Long- working life; Made with high quality of best quality alloy steel bar and tungsten carbides, through heat treatment so that it can withstand the toughest rock drilling demands,and transmit intensive impact energy into the ...
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