Jack hammers are tools that are used to directly exploit rocks. They drill blast holes in rock stratums in order to allow explosives to blast the rocks, thus completing the quarrying of stone or other stone works in addition, jack hammer can also be played as breaker, used to crush hard layers such as concrete. Their weights are light, usually about 25kg, working with hand-held operation. A variety of small diameter and shallow holes can be made. Jack hammer generally only punch downward or nearly horizontal holes.
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