21st Century - Expander Mandrels (Stainless Steel) Size:0.339 5x Maximum magnification

5x Maximum magnification

which includes normal communication

85% Biodegradable

you are now able to provide just the right amount of neck tension to properly hold the bullet without excessive resizing

21st Century - Expander Mandrels (Stainless Steel) Size:0.339 5x Maximum magnification21st Century Innovation Expander Mandrels when used with the Expander Die Body will expand the case neck for proper fit on the turning arbor. Precision CNC machined from high grade stainless steel. 21st Century Expander Mandrels and Arbors are designed for proper fit in the 21st Century die bodies. While these may work in most Sinclair and PMA die bodies we cannot guarantee proper fitment in those bodies. These are sized . 0008" (+ . 0002") below