This 30-piece hex key set offers a wide MM/AF range. It includes high - quality, precision hexagonal keys in both standard arm metric and long arm imperial sizes. The long - arm keys come in sizes like 0.028, 0.035, 0.05, 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4, 5/16, 3/8. The short - arm keys are available in 0.7, 0.9, 1.3, 1.5, 2, 2.5, 3, 4, 4.5, 5, 5.5, 6, 7, 8, 10mm. Enjoy a 1 - year manufacturer warranty for peace of mind.

Using this hex key set is easy. First, identify the size of the hex screw you need to work with. Select the corresponding hex key from the set. For better leverage, you can choose a long - arm key for hard - to - reach or stubborn screws. When using, make sure to insert the key fully into the screw head to prevent slipping and damage. As for maintenance, keep the keys clean and dry. After each use, wipe them with a dry cloth. Store the set in a dry place to avoid rusting. If you notice any signs of wear or damage, don't use the key, as it may not fit properly and could damage your screws. And remember, the set comes with a 1 - year manufacturer warranty, so if you have any issues, you can contact the manufacturer.