The RAM portable printer holder uses a unique patent pending spring loaded mechanism that provides a strong hold, yet provides easy removal for printer storage. At each end of the cradles are side clamping plates that are designed to fit cleanly around the edges of a printer. COMPATIBLE PRINTERSCitizen CMP-30/40Zebra QLN420Brother RJ-3 seriesIntermec by Honeywell PB-50/51