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These non-stick bushings are an ideal way to CA finish Pens! Avoid CA finish from bonding pen blanks to standard metal bushings. After shaping the pen blank, replace the metal bushings with these non-stick plastic bushings and apply your CA finish. Contains 4 cone shaped plastic bushings for 7mm/0.246" mandrels. Each plastic bushing has an indentation to accept a 60-degree cone on the back for between center turning. These bushings fit most sizes of pen kits and pen mandrels.