Is there a smarter Way to solve this?

I m a beginner with Spigot API, i mean i started plugin coding yesterday.
Is there a smarter way when opening an Inventory with a command and then clicking on the Item to get it in your own Inventory? i had to create the Item twice to get it working. here is my code:

Code (Java):

public class KitCommand implements CommandExecutor, Listener {

    Inventory inventory = Bukkit.createInventory(null, 9*3, "§6§lKit-Inventar");  
    @EventHandler
    public void handleInventoryClick(InventoryClickEvent event) {
        Player player = (Player) event.getWhoClicked();
        if(event.getClickedInventory().equals(inventory)) {
            event.setCancelled(true);
            ItemStack item = new ItemStack(Material.IRON_PICKAXE);
            ItemMeta itemMeta = item.getItemMeta();
            itemMeta.setDisplayName("§6Spitzhacke der Verdammung");
            itemMeta.addEnchant(Enchantment.KNOCKBACK, 10, true);
            item.setItemMeta(itemMeta);
            player.getInventory().addItem(item);      
        }
    }
    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if(sender instanceof Player) {
            Player player = (Player) sender;
            if(player.hasPermission("pluginzboi.kit")) {
                if(args.length == 0) {              
                    ItemStack item = new ItemStack(Material.IRON_PICKAXE);
                    ItemMeta itemMeta = item.getItemMeta();
                    itemMeta.setDisplayName("§6Spitzhacke der Verdammung");
                    itemMeta.addEnchant(Enchantment.KNOCKBACK, 10, true);
                    item.setItemMeta(itemMeta);              
                    inventory.setItem(13, item);          
                    player.openInventory(inventory);
                    player.sendMessage("§aWähle ein Kit!");      
                } else
                    player.sendMessage("§cBitte benutze §6/kit$c!");
            } else
                player.sendMessage("§cDu hast dazu keine Rechte!");
        }  
        return false;
    }
}