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