Question

a low-velocity fastening system that is used to drive steel pins or threaded studs into masonry and steel is a(n) _____.
options (partially visible):
pneumatic screw driver
impact-actuated tool
air impact wrench
nail hammer drill

Explanation:

A low - velocity fastening system used to drive steel pins or threaded studs into masonry and steel is a ram hammer tool (also known as a powder - actuated tool in some contexts, but among the given options, the ram hammer tool fits this description. The other options: an automatic screw driver is for screws, an impact - activated tool is not the typical term for this, and an air impact wrench is for nuts/bolts, not for driving pins/studs into masonry/steel).

Answer:

D. Ram Hammer tool (assuming the fourth option is labeled D, if the original labels were different, adjust the label but the text should be "Ram Hammer tool" as the correct option for a low - velocity fastening system to drive steel pins/threaded studs into masonry and steel)