Hammer drill

[1][2] It is a type of rotary drill with an impact mechanism that generates a hammering motion.

[9] In addition, the Chinese also used a cutting head secured to bamboo rods to drill to depths of 915 m (3,002 ft).

German company Fein patented a Bohrmaschine mit elektro-pneumatischem Schlagwerk ("drill with electro-pneumatic striking mechanism") in 1914.

Although each blow is of relatively low force, these thousands of blows per minute are more than adequate to break up concrete or brick, using the masonry drill bit's carbide wedge to pulverize it for the spiral flutes to whisk away.

Holes in hard materials are needed for anchor bolts, concrete screws, and wall plugs.

The system was designed by Bosch in 1975 and stands for "Stecken – Drehen – Sichern" which is German for "Insert – Twist – Secure".