Part of an iron file from the 1845 British Northwest Passage Expedition led by Sir John Franklin. The file had been repurposed by Inuit to strengthen the sledge runner where the frame had broken. It is flat on one side and curved on the other with diagonal groves across the surface. One end has been reshaped into a point similar to a chisel.

The file was obtained by the Franklin Search Expedition,1864-9, led by Captain Charles F. Hall, from Pelly Bay Inuit while he was in Repulse Bay in July 1866. The draft 1913 Royal Naval Museum, Greenwich, catalogue entry for Case 3, No 49 (corrected to 46) quotes from a letter of Captain Hall's: 'This file I took from the runner of a sledge that did belong to Old Kok-lee-arng-nŭn. now mine. the file and a piece of galvanised iron rod having stamped upon it the broad arrow, were lashed on the runner to strengthen it[,] the frame having been broken[.] Both file and rod came from Ook-joo-lik where many white men starved to death. The file belonged to Koon-e-ou-uk son of Kok-lee-arng-nŭn and was used by him in manufacturing oo-koo-suks (stone kettles). Hall July 12th 1866. This sledge made of wood that was part of the Victory mast.'

The file was presented to the Royal Naval Museum by Sophia Cracroft, Sir John Franklin's niece and displayed at the Royal Naval Museum, Greenwich, Case 3, 'No. 46. File taken from the runner of a sledge.'