motoman_mh50_support URDF frame location

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Hello, link text In motoman_mh50_support URDF distance between joint_6_t and tool0 is 0.175m also we can see in CAD model.

<link name="${prefix}link_6_t">
    <visual>
        <geometry>
            <mesh filename="package://motoman_mh50_support/meshes/visual/mh50_link_6_t.stl"/>
        </geometry>
        <material name="yaskawa_blue"/>
    </visual>
    <collision>
        <geometry>
            <mesh filename="package://motoman_mh50_support/meshes/collision/mh50_link_6_t.stl"/>
        </geometry>
    </collision>
</link>
<link name="${prefix}tool0"/>

.............................................................................................

<joint name="${prefix}joint_6_t" type="revolute">
    <parent link="${prefix}link_5_b"/>
    <child link="${prefix}link_6_t"/>
    <origin xyz="0 0 0" rpy="0 0 0" />
    <axis xyz="-1 0 0" />
    <limit lower="-6.2831" upper="6.2831" effort="333.43" velocity="6.283"/>
</joint>
<joint name="${prefix}joint_6_t-tool0" type="fixed">
    <origin xyz="0.175 0 0" rpy="3.1415926 -1.570796 0"/>
    <parent link="${prefix}link_6_t"/>
    <child link="${prefix}tool0"/>
</joint>

But when I see in RVIZ, why there is some gap in last tool0 frame location? this frame location should be at last link, why there is some gap? or am I understanding wrong?

link of RVIZ image, link text

thanks.