These Ball knobs are constructed using a Technopolymer (Polyamide PA), which gives great heat and cold resistance as well as impact stress resistance. This makes these a strong, robust and durable part. Especially suited for mechanical function components and mechanical engineering, these knobs have many more uses, from cabinet doors to wheel turning these knobs are a great addition or replacement to your old components. Features and Benefit: Temperature resistant -40 C to 180 C so can be used in high temperature machinery or in cold environment areas Impact stress resistant to avoid breakages when accidental heavy contact is made Zinc plated Steel bushing provides that added resistance to corrosion from things such as petrol or alcohol Typical Applications: Mechanical engineering Cabinet and storage solutions Automotive solutions