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If you insist on adding decorative patterns to project blanks the old fashioned way using a lathe this part may be perfect for you. The inside diameter of each blank is sized to accept an 8mm brass tube from compatible pen or other wood working project kits. Each blank has a length of 5.1 inches (12.95cm).
Choose from one of 5 outside diameters: Extra Small outside diameter = 500 mils (12.7mm) Small outside diameter = 625 mils (15.8mm) Medium outside diameter = 750 mils (19.0mm) Large outside diameter = 875 mils (22.2mm) Extra Large outside diameter = 1000 mils (25.4mm)