They are for 4 bolt shoes, so you don't wear out the base of your expensive carbon shoe. If you are using the 3 to 4 bolt adapter then that is easily replaced instead - or that's the idea anyway.
For want of the proper bits, some gaffer tape is all I've got there
@Kimmo started
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They are for 4 bolt shoes, so you don't wear out the base of your expensive carbon shoe. If you are using the 3 to 4 bolt adapter then that is easily replaced instead - or that's the idea anyway.