Series HD high air-press DTH are designed as a hammer drill. They differ from other rock drills, however, through continuous operation down against the drill bit.

• HD系列高风压冲击器是一种冲击凿岩工具，但他与其它凿岩工具不同的是，凿岩过程中它始终留在孔的底部，活塞直接冲击钻头。