Knocking a hammer indoors with an echo: Listen & Download Knocking a hammer indoors with an echo .mp3 Error! Change your browser, please! ⇓ Download Sawing ⚠ Leaves, Excavator starts ⚠ Plane ⚠ Drill machine ⚠ Construction, destruction of glass and ⚠ Manual grinder ⚠ Digging in the tool box ⚠ Vise make clamp ⚠ Bulldozer working ⚠ Jamming, Excavator approaching ⚠ Electric planer ⚠ Screwdriver ⚠ ★★★★★