Stanley Heavy Duty Staples 6mm These Stanley Heavy Duty Staples are ideal for use with a variety of heavy duty staplers. Colour: grey Weight (kg or g): 0.920kg Unit Dimensions (w x h x d mm): 0.140 x 0.050 x 0.135m Material: Metal Length: 6mm Effect and finish: Galvanised. Quantity in pack: 1000.