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✅
Your problem is the boostrap libraries: here you can find your updated jsfiddle.
The snippet:
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div class="btn-group" data-toggle="buttons">
<label for="id_tool_loc_0" class="btn btn-primary">---------
<input checked="checked" id="id_tool_loc_0" name="tool_loc" type="radio" value="">
</label>
<label for="id_tool_loc_1" class="btn btn-primary">T01
<input id="id_tool_loc_1" name="tool_loc" type="radio" value="1">
</label>
<label for="id_tool_loc_2" class="btn btn-primary">T02
<input id="id_tool_loc_2" name="tool_loc" type="radio" value="2">
</label>
</div>
Source:stackexchange.com