According to Official Guinness Records,
The largest paper clip measures 9 m 28 cm (30 ft 5 in) in height and 2 m 72 cm (8 ft 11 in) in width, and was created by Evgeny Stepovik in Miass, Russia. It was created from stainless steel and unveiled on 29 May 2010.
The base of a paper clip is: length is 25 cm (10 in), width is 25 cm (10 in), depth is 20 cm (8 in). Weight is 530 kg (1168.45 lbs), (net weight, without bolts and supporting structure).
For a complete list of 2010 records, please visit 2010 Guinness Records in Russia.