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  1. K

    How much faster Rotary Hammer vs. my Hammer Drill

    I have a 7.5 amp motor hammer drill. This hammer drill takes me 40/45 minutes to drill a 3/8" hole 2.5" deep, drilling into beach rocks. It take me a few seconds to drill the same hole into concrete. How much (many minutes) faster would a 5.2 Amp SDS Plus Rotary Hammer, 2920 blows per minute do...
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