22/20, 24/20, 24/22, 26/20, 26/22, 28/20, 28/22, 28/24
The Ferrule is the name given to the metal band that unites the pencil with the rubber, An essential tool if, like me, you can’t spell! A simple but very useful invention used in many applications where two different items are jointed together. Ferrules are often referred to as grommets within the manufacturing industry. Where’s Wallace??
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