RB7
Kemper RB7 · 102 mm (4 in) rib · Shaped steel · Trues the wall and compresses the surface
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A 102 mm (4 in) potter's rib for shaping and compressing on the wheel.
RB7 is the 102 mm (4 in) rib in Kemper's potter's rib range. A rib does two jobs at once on the wheel: it trues the wall and it compresses the surface, which is what closes up the throwing rings and reduces the chance of an S-crack later.
