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M3 x 10mm Full Thread Cap Head Screws (DIN 912) - Thread Locking 18-8 / 304 Stainless Steel: Accu.co.uk: Precision Screws
Raptor Security Head Eliminates Lock Washers
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Husqvarna Head Lock Screw
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ADS T-Screw / T-Head Security Screw for T-Lock Picture Security Hardwa – ADS ART DISPLAY SYSTEMS