The ST400 barbed staples are 4mm (9 gauge) diameter and are recommended to be used for rural livestock fencing, medium mesh, heavy mesh and heavy woven fencing. It is also great for highway boundary fencing. The staples have also been used in Rural utilities applications for attaching the earth wire to power poles.
Available in:
A12635- 2” (50mm) length barbed staples 1000 staples per/box
A12625- 1 3/4” (45mm)  length barbed staples 1200 staples per/box
A12615- 1 1/2” (40mm) length barbed staples 1375 staples per/box