Replacement grease nipples as found on the top arms. They can get blocked or fail to retain grease. Cheap as chips..probably cheaper now with all the price increases!
PRICE IS FOR ONE
Use this when replacing a top ball joint to enable servicing the ball joint. By removing the ball joint and drilling a M6 thread in the centre of the hub housing and fitting a nipple under will allow the ball joint to be lubricated. You have to dril a 1-2 mm hole in the underside of the ball joint to allow grease to enter. Pack the housing with grease (I use a Moly grease) and screw in the ball joint . Hydraulic pressure will force grease into a tired joint and make it useable again!