Metric Hex Key Sets With Secure Tools, it is easy to find high-quality metric hex key sets to suit your needs. Our metric hex key sets have been created and customised to include a smooth metal folding holder and a tether hole, making working at heights a breeze.Metric hex key sets, also often known as Allen keys, are used to drive hexagonal socketed bolts and screws. You will need these sets for metric measures. Our metric hex key sets have been expertly crafted to provide you with a durable and reliable addition to your toolset.Secure Tools is a dependable industry provider that delivers long-lasting and cheap tools to everyone, from DIYers to professionals in the construction business