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No.4 (2.9mm) x 1/2 inch (12.5mm) Self Tapping Security Countersunk Screws - A2 Stainless Steel: Accu.co.uk: Precision Screws
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Problems With Tamper Proof Screws | Bryce Fastener | Anti Theft & Vandal Resistant High Security Screws | What Is the Best for Safety?
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