Question

what material is drilled with a hammer drill?
hardwood
cast iron
stainless steel
concrete

Explanation:

Hammer drills are specifically designed for drilling into hard, dense materials like concrete. They use a hammering action in addition to rotation to break up the material as it drills. Hardwood can be drilled with a regular drill, cast iron and stainless steel may require specialized drill bits but not the hammering action of a hammer drill.

Answer:

concrete