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.
(although orbitals can be done in many places, the most common is just inside the outer ear rim.). Helix (also called âcartilage piercingâ) â any piercing of the outer ear rim itself. Daith â a piercing of the fold of cartilage where the outer rim of the ear meets the face. Industrial (also called scaffold piercing) â any set of two piercings of the outer rim or âhelixâ of the ear that are connected by a single piece of barbell jewelry.