Amazon.com: 20pcs M5 x 16 mm (0.8mm Pitch) 8.8 Grade Alloy Steel Allen Hex Bolt Socket Flat Head Screw ABBOTT : Industrial & Scientific
Amazon.com: uxcell M5 x 16mm Metric Hex Socket Countersunk Head Screw Bolts Black 50PCS : Industrial & Scientific
Class 8.8 Steel Fully Threaded Rod, Zinc plated, Meets DIN 975, M5-0.8 Thread Size, 1 m Length, Right Hand Threads: Fully Threaded Rods And Studs: Amazon.com: Industrial & Scientific