Amazon.com: Stainless Steel Sign Mounting Hardware Tamper Proof Star Drive Screws with Security Nuts Kit 5/16"-18 x 2" for U Channel Post - 25 Pieces : Industrial & Scientific
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Tamper-Proof Security Fasteners
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6 x 1-1/2" Button Head Torx Security Sheet Metal Screws Stainless Steel Tamper Resistant, Qty 25 Number 6 Size x 1-1/2" Length by Fastenere: Amazon.com: Industrial & Scientific