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1/4-20 Stainless Steel One Way Security Screws Tamper Resistant Machine Screws - Qty 25 (1/4"-20 x 1"): Amazon.com: Industrial & Scientific
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OW410 | Tamper-Proof Screw, Dedicated Tool, One-Way Screw Use, Removal Tool | SAIMA CORPORATION | MISUMI South East Asia
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