How to get index value as an id to div?

Currently, I am using Angular 2.0. I have an array called addExtra: number[] = [0,1,2,3];.

My HTML code is as follows:

<div *ngFor="let val of addExtra">
<div class="row">
<div style="margin-left:15px;">
<button class="btn btn-danger btn-delete"
(click)='delete(val)'>
<i class="fa fa-times" aria-hidden="true"></i>
</button>
<label for="isCheckBox">Draw</label>
<input id="isCheckBox" id=val type="checkbox" class="setCheckbox" (change)="isChecked($event)" style="vertical-align: text-bottom;" />
</div>
</div>
</div>


How do I get the val meaning 0, 1, 2, 3 as id to the checkbox.

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