Yes, that is an Allen key. It is a type of hex key tool used to drive bolts and screws with a hexagonal socket in their heads. The name "Allen key" comes from the Allen Manufacturing Company, which first introduced this type of tool. It is commonly used in furniture assembly, bicycle maintenance, and other mechanical applications. **

To remove stripped Allen key screws, you can try using a rubber band or a piece of steel wool between the screw head and the Allen key to provide better grip. Alternatively, you can use a screw extractor tool specifically designed for removing stripped screws. Another option is to carefully drill a small hole into the center of the stripped screw head and then use a screw extractor to remove it. If all else fails, you may need to use a Dremel tool to carefully cut a slot into the screw head and then use a flathead screwdriver to remove it. **

To clean a multifunctional Allen key set, you can start by wiping down the tools with a clean cloth to remove any surface dirt or grime. For tougher stains or buildup, you can use a mild soap and water solution to gently scrub the tools. Make sure to dry the Allen keys thoroughly after cleaning to prevent rusting. Additionally, you can apply a light coating of oil to the tools to help prevent corrosion. **

A fast alternative to an Allen key is a power drill with a hex bit attachment. This allows for quick and efficient tightening or loosening of screws and bolts that require an Allen key. The power drill can save time and effort, especially when dealing with a large number of fasteners. However, it's important to use the power drill carefully to avoid over-tightening or stripping the fasteners. **

A quick alternative to an Allen key is a small flathead screwdriver that can fit into the hexagonal socket of the screw or bolt. Another alternative is a small adjustable wrench that can be used to turn the hexagonal head. In a pinch, a coin or a sturdy piece of metal with a flat edge can also be used to turn the screw or bolt. However, it's important to note that these alternatives may not be as effective or precise as using an Allen key, so they should only be used temporarily until an Allen key can be obtained. **

If the Allen key is broken inside the screw, you can try using a rubber band to grip the broken end and turn it out. Alternatively, you can use a small flathead screwdriver to carefully tap into the broken Allen key and turn it out. If the screw is stripped, you can try using a screw extractor or drilling a small hole into the screw head to create a new grip for a screwdriver. If all else fails, you may need to use a drill to carefully remove the screw. **

If the Allen key is too big for the screw or bolt you are trying to turn, you should try to find a smaller size Allen key that fits properly. Using a larger Allen key can strip the screw or bolt, making it difficult to remove or causing damage. If you don't have a smaller Allen key, you can try using a different type of tool that fits the screw or bolt, such as a screwdriver or a wrench. It's important to use the correct size tool to avoid damaging the fastener. **

The amount of hand force allowed for tightening with an Allen key depends on the specific application and the size of the fastener being tightened. In general, it is recommended to use a moderate amount of force to avoid over-tightening and potentially damaging the fastener or the tool. It is important to follow the manufacturer's guidelines and use a torque wrench if specific torque values are required for the application. Over-tightening can lead to stripped threads, broken fasteners, or damage to the tool. **