Magento 1, delete products between ID X and ID Y

deleteProducts.php

<?php
// Put this in your Magento 1 root, replace the variables with your ID's
// Useful for deleting products when making an importer and starting from scratch.
$idStart = 50000;
$idEnd = 99999;

require_once('app/Mage.php');
umask(0);
Mage::app('admin');

$productCollection = Mage::getModel('catalog/product')
           ->getCollection()
           ->addFieldToFilter('entity_id', array('gteq'=> $idStart, 'lteq' => $idEnd));

$productCollection->delete();