Vision Bird Cage Perches are ergonomically designed with multigrip surfaces to promote foot circulation & help prevent foot problems in birds. In addition, the perch's exterior access design allows non-invasive access, thereby reducing stress on your bird during cage maintenance. Fits Vision models 100, 110, 210, S01 S02, M01, M02, L01, L02. Horizontal wire 1.6mm. Wire spacing (centre to centre) 12.3mm.