Strong 3-piece alloy steel jaw mechanism with hexagonal internal structure for a longer life and easy operating Reinforced 2mm thick Carbon Steel heat-treated handle for extra strength and durability Ergonomically designed handles for comfortable use Contains rivet noses for use with 2.4mm, 3.2mm, 4.0mm, 4.8mm and 6.4mm aluminum and steel rivets To operate, pre-drill holes into the items Noses are colour coded by size for easy identification and may be conveniently changed with no need for extra tools To operate, pre-drill holes into the items being joined together, the optimum drill size is 0.1mm biggee than the size of the rivet Spare replacement jaws and noses are available