Enlarging holes or aligning mismatched holes in metal is the job of a tool known as a reamer.

The process by which this is done is called Reaming and differs from traditional drilling as it requires an existing hole, or holes, as a starting point. A reamer cannot create a hole from scratch, only increase the size of current holes.

Below you will find a step-by-step guide to reaming along with technical recommendations, best practice advice and information on the range of HMT reamers available and the best situations in which to use them.


How to enlarge or align (Ream) a hole in metal:

Best Practice advice:

Now you know how, why would you want to ream a hole?

There are many reasons why holes need to be modified after they have been created – most commonly these can include specification changes, a change in the type of fixings to be used, or even simply a measurement mistake at some stage of the process.

Whatever the reason for enlarging a hole though, it has traditionally been difficult to do accurately on site and away from static, precision milling and drilling machines, especially in hard materials such as steel.

The question of "how to do this quickly and correctly" then became a real challenge.

It was a desire to provide a solution to these challenges that led us to create two brand new products - Enter the VersaDrive and ImpactaMag range of construction and fabrication reamers.

VersaDrive Impact Reamers


VersaDrive reamers are the perfect hole alignment and enlarging tool for metalworkers & steel erectors for keeping the job moving when a hole is misaligned or the incorrect size for the fixing.

Featuring a specially designed 6 flute cutting geometry and Titanium coating, VersaDrive™ Reamers are fully Impact rated and perform fastest when used with an Impact wrench providing ultimate cutting performance with virtually no powertool kickback.

VersaDrive Reamers have a patented non-slip, Hex shank suitable for use in any standard 1/2” drill chuck for cordless or pistol drills or used with a VersaDrive Rapid Lock adapter for use in a wide range of powertools such as Magnetic Drills.

Technical Quick guide

HMT ImpactaMag Reamer


The ImpactaMag™ HSS reamer is a unique double-use reamer for enlarging and aligning holes in metals and hard materials.

Specially designed cutting geometry allows the tool to be used in an Impact wrench or a Magnet drill. When used in an Impact wrench it is secured into a special adapter meaning the tool is easier to control, apply correct feed rate, and withdraw from the finished hole, enhancing tool life. This reamer will also fit into a standard Weldon magnet drill arbor.

The tapered design allows the narrow end of the ImpactaCut reamer to be entered into the existing hole and accurately centred.

The rotary/percussion impact cuts precise shavings off each side of the hole, up to the widest dimension of the reamer.

So how do you know which one is for you?

The correct tool for the job will depend on the drive tool you are able to use, the size of the final hole required and the material you are reaming.

When VersaDrive reamers are the best option:

When using a portable power tool like an Impact Driver or Impact Wrench and the final hole size required is below 26mm the VersaDrive Impact Reamer would be the recommended option. This tool quickly and easily fits the VersaDrive range of quick-change, rapid-lock adapters and can be used to enlarge a hole in materials up to 20mm thick.

VersaDrive reamers can also be used with cordless drills and magnet drills or pillar drills so for applications requiring holes up to 26mm diameter in materials up to 20mm thick VersaDrive reamers are still perfect for the task.

When ImpactaMag reamers are the best option:

If you are using a magnet drill without an adapter, require a hole size between 26-39mm or have material greater than 20mm thick then the ImpactaMag Reamer would be the recommended option.

With it’s Weldon shank the ImpactaMag reamer will fit directly into a standard 19.05mm arbor whilst it’s construction makes it perfect to tackle thicker materials, over 20mm in depth.

Many building and construction professionals will testify. A job on-site or in the workshop can be going fine until a small problem like a misaligned hole, a poorly drilled hole, or a connection hole that is too small, can put a very expensive spanner in the works.

Having a set of VersaDrive or ImpactaMag reamers on hand means this potential problem can be quickly overcome.