This set of Aluminium nails for nest boxes and bird feeders are not harmful to trees, making them suitable to mount and secure wild bird's nest boxes, bird feeders, bee houses and signage to trees in your garden. 

This set of tree-friendly nails includes 12 nails of three different lengths. 

Length of nails included: 4.5cm (1.77"), 6.5cm (2.56") and 8.5cm (3.35).