This is a mounting screw for a Miele dishwasher, it has a hex head. I have no idea what to call it to find more. I've searched for every possible combination of
Amazon.com: 8269145 Undercounter Dishwasher Mounting Bracket with Screws by Beaquicy - Replacement for Whirl-pool Ken-more Dishwasher - Replaces WP8269145 WP8269145VP (Pack of 2) : Appliances
E-Z Compact Dishwasher Bracket With Mounting Screws, 18in EZ Dishwasher Installation
2 Packs Undercounter Dishwasher Mounting Brackets Replacement with Screws, Dishwasher Upper Mounting Clips Parts, Compatible for Whirlpool, Kitchenaid, Maytag, Kenmore, Compare to 8269145/WP8269145 : Amazon.ca: Home
E-Z Dishwasher Mounting Bracket For Granite Countertop Installation 26.5" Long
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EZ Dishwasher Bracket Installation Video - YouTube