Ganter Standard Elements Mini Grid – Snap-in Pin Stainless Steel Grommets/GN 822.7/Bolt Diameter 4 mm/Pack of 2, GN 822.7-4-M8-C: Amazon.com: Industrial & Scientific
VIGRUE Hex Allen Head Socket Set Screws Grub Screw Bolts Assortment Kit, Carbon Steel Internal Hex Drive Cup-Point Screws with Hex Wrenches (M2.5/M3/M4/M5/M6/M8): Amazon.com: Industrial & Scientific