I have several boxes leftover from my patio installation.  These are NIB and contain 50 2.5” screws that are used with Gator Base Patio Paver Base system.  I am also told they can be used with Brock Paver Base brand too.  I used these to anchor the edging in and also scattered them around to the foam bases so they didn't shift on me at all. Note: at some point they changed the accent color from red to yellow.  They are identical but I have 3 red boxes left that are slightly dust covered but never used.  I am almost sold out of the yellow but they will be sold at a first come first serve basis.  Again, these are identical and just as functional, but they got a dusty during project. These are an AMAZING deal — cheapest I have seen these on amazon is $40 per box.  Detailed Information from Alliance Gator below

1/8LD Hollow Anchor 50 units— Fastening Gator Edge with the GATOR BASE SCREWS through the Gator Base reinforces the outside perimeter, creating a strong lateral support. GATOR BASE SCREWS are a required component on any Gator Base install.

About this item 1/8LD hollow anchor 

• Anchor expands to lock in place 
• 2.5 inches long 
• Fits Gator Edge to Gator Base
• Use with all Gator Base installation
• Use with all the Gator Edges: Rigid and Flex, Mini and Tile
• Reinforces the outside perimeter
• Creates a strong lateral support
• Locking all components into one
• Use GATOR BASE SCREWS to fasten Gator Edge to Gator Base