English: A photo of two types of chain ring bolts for bicycles. They differ in the lengths of the nuts, being made to span different widths. Notice that all parts except the silver nut are made for use with hex wrenches, it being slotted instead, for use with a special tool; a chain ring nut wrench. Where hex wrenches are used, the screws use 5mm, and the nuts 6mm.
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