These are high-quality M2 set screws made from hardened steel that are 2mm long. These can be used with popular crown and spur gears (e.g. Slot.It) if you want to ensure no portion of the set screw protrudes from the gear hub. Some manufacturers also use these for securing wheels (e.g. some Ninco Pro Race wheels).
Note: Requires .9mm (.035") hex driver which is available for purchase separately.
Package contains ten (10) set screws.