In this video I use some impact reamers to enlarge some holes in thick pieces of steel. Normally a job like this is difficult as the drill bit can snag, which can cause injury to the user. Now this job is much easier using HMT impact reamers. HMT have plenty of solutions for drilling steel and even harder types of steel such as rail track/Hardox etc.
Impact reamers are available in metric or imperial sizes-