The Standard SRN-9X is a proven, high-speed suction-feed rotary numbering system that produces clear number definition, even through multiple part sets, by ensuring positive point contact and easy platen pressure adjustment. As the head rotates, the numbering head is advanced, re-inked, and the number is offset directly to the sheet or set, just as on a press. You can repeat, skip and do multiple numbering without stopping the sheet, producing up to 36,000 impressions per hour.