Amazon.com: uxcell M5 x 16mm Metric Hex Socket Countersunk Head Screw Bolts Black 50PCS : Industrial & Scientific
DIN 931 / ISO 4014 Professional Hexagonal Screw with Shaft Grade 8.8 Galvanised Steel Hardened DIN931 Professional 6kt TGW G8.8 VZ SGH - M18 x 140 (Pack of 1) : Amazon.de: DIY & Tools
M6-1.0 x 16mm Flat Head Socket Cap Screws, 10.9 Grade Alloy Steel, Allen Socket Drive, Black Oxide Finish, Machine Thread, 50 PCS: Amazon.com: Industrial & Scientific