They're called SEMS SCREWS (or bolts) with DOG POINT.
Your example is probably Pan head Phillips (or Torx) Sems bolt with Dog point
These are in the U.S but are an example
https://www.ebay.co.uk/itm/Black-T30...-/221702942348
Last edited by focusv8; Sep 15, 2019 at 04:36 PM.