Old 08-21-20, 01:22 PM
Hits [ENTER] b4 thinking
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Can't tell for certain in the pic, but if you don't have a cover, it is either missing or these aren't self extracting cranks.

Cover is essentially a disk with a big hole that threads onto the crank. The hole will be big enough to let you put a tool, hex key in your case, through it and into the socket of that bolt. Some covers use just a size or two bigger hex keys. Others might use something else like a pin spanner and hex key combo like below.

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