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aksyon lè une. Yo relativement peu akoz mank fè pati ak theycan pèse plus fòmasyon tankou argile rèd ak mudstones byen vit. Gwo bout tire
eng
action when rotated. They are comparatively inexpensive due to the lack of moving parts and theycan penetrate softer formations such as stiff clays and mudstones very quickly.The drag bit