There are 3 styles of Screws for PETSAFE doors

PLEASE compare your Screw to my pictures. To MAKE SURE YOU ORDER THE CORRECT REPLACEMENT SCREWS

UPGRADED OEM SCREWS for Fine thread Only   20 PACK of Screws & Nuts (20 screws &  20 Lock Nuts are included) Door requires 3 to 6 For Freedom Door by PetSafe replacement flap PAC11-11037 to PAC11-11040 Original screws tend to rust and fall out New Stainless Steel screws  & Lock Nuts are 18-8 A2 High strength (These do not rust, unless under water.) My freedom door was falling off and realized that the screws rusted and loosen up. So I looked for replacement screws and nuts to help keep flap in place, couldn't find them. So I ended up ordering Stainless Steel Screws & Nuts to upgrade my own pet door. I offer these to help others fix there pet doors. Install screws as usual then add Nuts on back to help keep flap from moving. Please Look at Pictures! What U see is what you get! I Strive for 5 Star (100%) Customer Satisfaction!