The 3″ caster model will allow your feet easier and quicker movement when you are in a kneeling/sitting position
This model would be your choice if you need to move rather quickly in a lateral position, use it mostly on rough surfaces, have large feet or long legs, or work mostly kneeling/sitting, such as auto body repair and PDR techs, painters, fabricators, etc
is sold separately
ADJUSTABLE SEAT Instead of sitting back on your heels, the fully adjustable seat provides upper body support, leaving your feet free to control your movement
KNEEPADS Comfortable attached floating-like kneepads allow your knees to rest and move freely. They eliminate direct knee-to-floor pressure and circulation problems and will allow you to work in shorts without having to wear kneepads with straps
CASTERS: Allow you to roll to move instead of crawling and bouncing on your knees. It elevates your body and eliminates the normal pressure on toes, ankles, and knees. It will allow you to work over dirty, wet, or dusty areas easier and cleaner
TOOL TRAY This feature is appreciated by everyone who uses the Racatac. They love having a place to keep their necessities right there rolling with them