Staple
From Amazon
Rapid 73/12mm Super Strong Staples, For Stapling 40-70 Sheets, Use with Heavy Duty Stapling Pliers, Galvanised Wire, Box of 5000, 24890800
Rapid Online
Rapid Staple 73/12 5M G Super Strong - Pack of 5000
OnBuy
Rapid 24890800 73/12 Super Strong Staples, Hard Galvanised Wire, 10 mm Leg Length 40 Sheets, Pack of 5000 - stainless steel