Scripting Reference
Bounds.Bounds

static function Bounds (center : Vector3, size : Vector3) : Bounds

Description

Creates new Bounds with a given center and total size. Bound extents will be half the given size.

JavaScript 
// Create pillar bounding box centered at the origin

var bounds = Bounds (Vector3.zero, Vector3 (1, 2, 1));
using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Bounds bounds = new Bounds(Vector3.zero, new Vector3(1, 2, 1));
}
import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public bounds as Bounds = Bounds(Vector3.zero, Vector3(1, 2, 1))