onEntityDamageByEntity Help! PLS!

One Question how can i make that a Share do 1 Hit?

Code:

    @EventHandler
    public void onEntityDamageByEntity(EntityDamageByEntityEvent event) {
            Player damager = (Player) event.getDamager();
            if (damager.getItemInHand().getType().getId() == 359) {
                event.setDamage(20);
            }
        }
    }

dosent work :/