Any one know what this is for?

[f888fhw]

Can anyone shed any light on what the highlighted holes are for? Click the image below.

http://i276.photobucket.com/albums/kk12/51m017/th_DSC_0098_zps931bd345.jpg (http://s276.photobucket.com/albums/kk12/51m017/?action=view&current=DSC_0098_zps931bd345.jpg)

[PaulUpton]

Says cant load photo when trying to make bigger (well from my phone at least)

[RudolfXC]

Body posts or bumper?

[Lee24h]

Grub screws caster adjustment