304 grade Stainless Steel screw eyes are  great for hanging perches or any wood you want to hang.

Screw eye Measurements (approximate)

Medium- 33mm long, 14mm OD x 8mm ID x 3mm THK, 16mm timber thread. Suitable for small to large birds.

Large - 50mm long, 19mm OD x 11mm ID x 4mm THK, 25mm timber thread. Suitable for medium to extra large birds.

Abbreviations: OD = Outside dia. ID = Inside dia. THK= Thickness

This product is safe and non toxic.