This kit allows you to widen the front track of the RTB by 2.5mm. This allows the car to have more speed through large corners.
 
The recommended wheel offset with these wide arms is 0.5mm
You will need to extend the length of each turnbuckle by 1.25 mm to maintain your toe out setting
 
This kit also allows you to adjust the caster by simply changing the arms. Four caster settings are available:
0 degrees of caster using the wide arms marked “W.”
3 degrees of caster using the lower wide arm marked “W” and ‘C3’ and the upper wide arm marked “W”
3 degrees of caster using the upper wide arm marked “W” and ‘C3’ and the lower wide arm marked “W”
6 degrees of caster using the lower wide arm marked “W” and “C3” and the upper wide arm marked ‘W’ and “C3”
 
Included in the kit: 1.25mm inner joint shafts to replace the original one