Bolsters?

Same as they would on a slipjoint or any folder for that matter; Aesthetics and protection from chipping on the main handle material.
 
Quick answer from about.com.

Sounds about right.

Definition:
To help, prop up, strengthen or reinforce.

A knife bolster is the thick junction between the handle and the knife blade which provides a smooth transition from the blade to the handle. It strengthens the knife, adds durability, and provides a counter-balance. Since the handle is lighter than the blade, the bolster contributes to better balance and improves control.
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