6 x 3/4" Button Head Torx Security Sheet Metal Screws Stainless Steel Tamper Resistant, Qty 25 Number 6 Size x 3/4" Length by Fastenere: Amazon.com: Industrial & Scientific
10 M4 Stainless Tamper Proof Torx Flat Head Security Screws with Screwdriver | eBay
What is a Torx Screw - Insight Security
8-32 x 1/4 Tamper Resistant Torx Drive Flat Head Socket Machine Screw – FMW Fasteners