This is a speedo shaft that goes into the gearbox to replace the standard square one. This one is star shaped, so doesnt wear down easily, and therefore stops that annoying bouncing speedo needle at low speeds..
There are guides on here somewhere as to how to fit it.
Renault part no: 7700722304. Still in the Renault wrapping.
I paid £4.18 from Renault, so would like £4 inc. postage.
Dan