This is a single replacement machined aluminum rod end.  These thread on to #6-32 studs and the balls are sized to accept either #4-40 or M3 mounting hardware.  If you are replacing our Dubro rod ends with these, there will be virtually no change in your wheelbase.  We do recommend using our CPE-CONM3_16 conical washers with these.  Full rod end specs are listed below:'

Specifications:

• 28mm long & 7mm diameter (shaft area) & 10mm diameter (ball area)
• Center hole to end of the ball end is 5mm and 22mm
• Ball hole is 3.1mm
• CNC Machined rugged aluminum construction
• Preinstalled with a stainless steel ball
• Fit 6-32 threaded shaft