Model 309 is a sliding door cage for large dogs and similar size animals. One entire end of this cage is a sliding door designed for easy transfer from live traps. This transfer cage matches up nicely with the rear sliding doors of our 20"W x 26"H dog trap models 610A, 610B, 610C, 210A, 210B, and 210C. This transfer cage measures 36L x 20W x 26H" and is constructed of 1 x 2" - 12 gauge wire mesh. This cage has a sheet metal tray bottom for animal feet comfort and it is removable for easy cleaning.