Gauge and hole size are two different measurements. Gauge tells you how thick each wire is. Hole size tells you the size of the gaps between wires. Choosing a thicker wire does not automatically give you smaller gaps.
What does wire gauge mean?
On our welded-mesh options, 19G is approximately 1 mm thick and 16G is approximately 1.6 mm thick. The lower the gauge number, the thicker the wire. Two panels can have the same hole size while using different gauges.
What does hole size mean?
Hole size describes the nominal opening between the wires, not the wire thickness. For example, a 1/2" x 1" option has an opening of roughly 13 mm in one direction and 25 mm in the other. Our ranges include these sizes:
- 1/2" x 1/2": approximately 13 x 13 mm
- 1/2" x 1": approximately 13 x 25 mm
- 1" x 1": approximately 25 x 25 mm
- 2" x 2": approximately 51 x 51 mm
The illustrations compare mesh at the same scale; they are not actual size on your screen. Available gauge and hole-size combinations vary by product, so check the options on the product page.
Which mesh should I choose?
For a catio or cat run
We use 16G mesh for our catios and freestanding cat runs. We do not recommend our thinner 19G panels for cats. Choose a hole size suited to your cats and the location too: gauge alone does not make an enclosure safe.
For rabbits, poultry and other small animals
The right choice depends on the animal and whether predators can reach the enclosure. 19G is a lighter-duty option, but it should not be relied on as fox protection. For outdoor rabbits where foxes are a concern, the Rabbit Welfare Association recommends 16G welded mesh with 1/2" x 1/2" (about 13 x 13 mm) openings.
Where predators are a concern
Thicker wire and appropriately small openings are important, but no mesh choice alone makes a run automatically fox-proof or rat-proof. Strong framing, securely fixed mesh, sound welds, a secure door and roof, and protection against digging or gaps at ground level all matter.
In short
Gauge = wire thickness. Hole size = gap size. Check both when you choose a product. If you are unsure, tell us which animals will use the run, where it will sit and which predators you need to consider, and we can help you choose a suitable option.