THIS ENGRAVING SYSTEM GIVES EACH HANDPIECE AN EXCELLENT AN EXCELLENT RANGE OF POWER WITH PERFECT CONTROL THROUGHOUT AN EXPANDED RANGE OF IMPACT SPEEDS. THE GRAVERMAX G8 HAS CONNECTIONS FOR TWO IMPACT HANDPIECES AND AN AUXILIARY AIR CONNECTION FOR OTHER AIR FILTER, AND REQUIRES CLEAN, OIL-FREE COMPRESSED AIR WITH MINIMUM 45 PSI (3BAR) PRESSURE AND 1.4 CFM (40 LITERS PER MINUTE) FILO. ELECTRICAL REQUIREMENTS ARE 100/240 V AT 50/60 HZ. STROKE SPEED RANGES FROM 400-8000 STROKES PER MINUTE (SPM). HANDPIECES SOLD SEPARATELY .