All of our listings Include hardware to attach products, but we understand some cages may need extra or wider washers. Additionally, sometimes hardware Is lost so we made this listing by request.
 
We use 1.5" washers for all products, except exterior guards. Those are 2" washers. 
For wood guards you need 1.5" long bolts
For metal ledges, tunnels and guards It Is 1" long bolts 
All are 1/4" thread size
 
Double up on washers or use 2" washers if bars in your cage are prone to breaking.