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
Phillips Round Head Machine Screw (W/Lock) 832 X 1/2: Stainless Steel Material with a passivated Finish (Package of 100) 8C08PRMS SSL: Amazon.com: Industrial & Scientific
ADS T-Screw / T-Head Security Screw for T-Lock Picture Security Hardwa – ADS ART DISPLAY SYSTEMS