Chrome Vanadium Steel is the most common material used.
The keys of the clarinet can either be made from nickel or silver.
Classically, they were made of ebony wood, but ebony is much too scarce and expensive to be used now, so today they are made of a very hard wood (typically maple or rosewood) polished very smooth, and coated with a plastic resin or black lacquer.,
fingers on keys
Wood is commonly used. I have a friend who is a harpsichord builder and his keys are made out of cow bones.
A regular hex key, or a hex socket with a ratchet.
In 1910 hex keys were invented
It depends what material they are made from
Rosewood.
The keys used to be made out of ivory but are sometimes now made out of plastic like material over wood.
The keys of the clarinet can either be made from nickel or silver.
Depends on the lock, but mostly metal and iron.
Hex screwdrivers and Allen keys are designed to fit in Allen head screws,used a lot in machinery.
Keys can be made of almost any solid material. Most modern keys are made of brass, aluminum, or various alloys that are of similar durability yet softness. The keys for old mortise door locks were made of iron. Many locks made in the middle ages and earlier used keys made of wood.
Snap-on hex keys are currently manufactured by Eklind Tool Co. in Franklin Park, IL. I know because I inspect the facility.
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Old skeleton keys were typically made of iron or brass. Iron keys tend to be older and have a rustic appearance, whereas brass keys were more common in the 19th and 20th centuries due to their durability and resistance to corrosion.
Though I don't have a 2001, I can tell you that most are now using torx bolts instead of hex keys.