300 pieces assorted sizes aluminum rivet nut kit.

These are the large-flange style and they are ribbed to grip better against rotation (the 6-32 is plain and not ribbed).

• 50 pcs of plane aluminum flange 6-32

      25 pcs each of: Knurled Aluminum 

• 8-32
• 10-24
• 10-32
• 1/4-20