PROLOK, Security screw, Resytork button head, Self tapper, 6 gauge (3.5mm) x 13mm, 2 way, AB type thread, 304 stainless steel, Pack of 25, Includes driver
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M3.5 (3.5mm x 6mm) Pozi Countersunk Machine Screw (Bolt) - Stainless Steel (A2) (Pack of 20) : Amazon.co.uk: DIY & Tools
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Hilitchi 50Pcs #6 x 1 1/2" Stainless Steel Button Head Torx Silver Security Screws Sheet Metal Screws Anti-Theft Tamper Proof with Bit T15 : Amazon.co.uk: DIY & Tools
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