This is a 1/8" stainless steel full cone spray jet. It's used on the high-efficiency, 3-jet RX-20 star assembly (head). This jet has an internal vein (HM-076078-EA) that manipulates the water into a dimensional cone shape.
This jet is easily clogged, because the orifice is much smaller and the interior of the jet has the addition of the vein.
Proper filter maintenance is critical.
If the jet does become clogged the best way to clean it would be to remove it and used compressed air to blow the debris out of the inlet side of the jet. If that doesn't work the jet can be unscrewed and the vein can be removed and cleaned. The vein (HM-076078-EA) is extremely small be mindful of this part because it sits loose in the jet.