The RAM Quick Draw Jr. holder uses a unique patent pending spring loaded mechanism that holds strong, 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. Clamping Dimensions: Width: Min 6.625" to Max 10.5 Height: Max 2.5" Compatible Devices: Brother - MW-100 Brother - MW-120 Brother - MW-140 Brother - MW-260 Zebra - QL 220 Zebra - QL 320 Zebra - QL 420 Plus Zebra - RP4T Printronix - M4L