App series primary impactors. trio app series horizontal impact crushers are designed for primary crushing in a wide range of applications when processing low abrasive materials. these machines are known for their unique ability to process rocks at reduction ratios up to 16 to 1. view product.Apr 11, mini rock crusher - 911metallurgist. 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 1.5mm or.