Knocking a hammer indoors with an echo: Listen & Download Knocking a hammer indoors with an echo .mp3 Error! Change your browser, please! ⇓ Download Construction, destruction of glass and ⚠ Staple gun ⚠ Metal file ⚠ Grinder ⚠ Tool belt thrown to the ground ⚠ Concrete mixer ⚠ Sawing ⚠ Screwdriver ⚠ Open, close the lock, Tool box ⚠ Hammer hammering a nail into a tree ⚠ Digging in the tool box ⚠ Electric saw ⚠ ★★★★★