Kuanto Kusta for WooCommerce - Set free shipping for products above a certain price

kuantokusta_product_node_default_shipping.php

<?php
add_filter( 'kuantokusta_product_node_default_shipping', 'kuantokusta_default_free_shipping', 10, 3 );
add_filter( 'kuantokusta_product_node_variation_shipping', 'kuantokusta_variation_free_shipping', 10, 3 );
function kuantokusta_default_free_shipping( $shipping_cost, $product, $product_type ) {
	return kuantokusta_free_shipping( $shipping_cost, $product );
}
function kuantokusta_variation_free_shipping( $shipping_cost, $product, $variation ) {
	return kuantokusta_free_shipping( $shipping_cost, $variation );
}
function kuantokusta_free_shipping( $shipping_cost, $product_or_variation ) {
	if ( wc_get_price_including_tax( $product_or_variation ) >= 175 ) {
		return 0;
	}
	return $shipping_cost;
}