Rock Durability Testing Apparatus meet ISO standard steel made,High fine quality stable performance, with jaw plate Rock Durability Testing Apparatus General Description: Standard: GB National , BS INTERNALTIONAL Specification: 1. Power: 90W 2. Voltage: 380V, 3 phases 3. Rotation: 20rpm 4. Cylindrical screen drum: dia 140mm 5. Specimen: 40-60g/pc x 10 pcs, grinded in round form by abrasive disk ...