General description Our hole plates for bird boxes are designed to protect the inhabitants from predators attempting to enlarge the nesting box hole. These discreet stainless steel plates easily attach to the front of bird nest boxes, effectively preventing even the most aggressive attackers from gaining access. Additionally, they can be used to reduce the hole size of your bird nesting boxes, allowing you to attract specific bird species by limiting access to larger birds. Technical specifications Material: Stainless Steel Diameter of hole: 45mm External dimensions: 60mm x 60mm Weight: 0.1kg Fixing: Screw holes in corners with small screws supplied Other information Available hole sizes: 25mm, 28mm, 32mm, and 45mm Sold in packs of ten or individually