Arrow T50 Series top quality 0.050 wire staples to suit:
T50, T55, T50PBN, HT50P (up to 12mm only), HTX50, ETFX50, ETF50PBN, CT50K, 5700 AND 8000.

The Arrow ARRT50516S T50 Staples Box contains top quality 0.050 wire staples for use with T50 and T55 tackers:

These stapes can be used for roofing felt, housewrap, upholstery, valances, headboard coverings, shelving, etc. with the following specifications:
Size: 5/16 inch / 8mm
Qty: 1250 staples