1. Adopt round cutter and straight cutter to trim with easy operation. 2. Trim the raw edge quickly, exactly and safely, the trimmed edge is smooth and it has no harm to the insole. 3. Equip with knife grinding device. 4. Simple operation, so newer can mastered it easily. 5. The efficiency is 5-8 times of manual operation. 6. Pay attention: please equip with cooling water-cup device when trimming the raw edge of rubber soles.