Measuring a bicycle chain's pitch can be used to identify chain wear and flag the need for a replacement chain and/or cogs and chainrings. Bicycle Chains: Length, Width, What's Best to Buy etc.
An industrial, or scaffold, piercing is made up of two holes that are connected by a single piece of jewelry (usually a long barbell). An industrial piercing is commonly made through the cartilage on the upper ear, with one hole close to the head and the other further down on the outer rim. Two or more industrials on one ear is sometimes referred to as an ear cage.
Evidence presented about the efficacy of daith piercings for migraine relief was purely anecdotal (and the source of the claim unclear): Dave Kurlander, owner of the Tempest Artistic Studio in Hopewell Junction, NY performs the daith piercing on clients, and he truly believes itâs the way to go.