Question

which fastening system is used to drive steel pins or threaded studs into masonry and steel?
mini hammer drill
pneumatic screw nailer
powder - actuated tool
air impact wrench

Explanation:

Powder - actuated tools are designed to drive steel pins or threaded studs into masonry and steel by using a controlled explosion of powder to create the driving force. Mini hammer drills are mainly for drilling holes. Pneumatic screw nailers are for driving screws and nails in lighter - duty applications. Air impact wrenches are for tightening and loosening nuts and bolts.

Answer:

powder - actuated tool