columnResizeHandleWidth Number (default: 3)

Defines the width of the column resize handle in pixels. Apply a larger value for easier grasping.

<div id="grid"></div>
<script>
var dataSource = new kendo.data.DataSource({
  data: [ { name: "Jane Doe", age: 11 }, { name: "John Doe", age: 12 }]
});
$("#grid").kendoGrid({
  columnResizeHandleWidth:20,
  dataSource: dataSource,
  resizable:true
});

</script>