1″ x 2″ Mini Rock Crusher. US700. The 1″ X 2″ 911MPEJAC12 Small Rock Crusher is designed to finely crush rock and stone like aggregates or your favourite ore type (gold, silver, copper, etc.) from 3/4" (20mm) feed size down to a D50 – 50% passing 50 Mesh (300um). This also correspond to a crushed products P80 size of 80% passing or 14 mesh.