Numbering Machine 8 Digit Straight Backward for Heidelberg GTO QM and PM Go to amazon.com Related posts Top gto numbering machine for 2022 FeatureModel: CL1100Wheels: 8 Digit Straight BackwardCharacter height: 5/32" (4mm) GothicCompatible With: Heidelberg GTO52, GTO46, QM46 (Quickmaster) and PM (Printmaster).