Straight or curved, mattress needles are hard to come by. You will find all the existing sizes on our site. They are used for easily going through large thicknesses. As for the spectacularly large packing needles, they were once used for large bundles of cotton or fabric. Nowadays they are often used for weaving. Triangular sail needles, as the name implies, are used for repairing sails. They are also useful for repairing canopies, tents, deckchairs and all other thick, waterproof fabrics.