Price -- -- be in commonly, because door window of alloy of high grade aluminium profile is produced cost is tall, price than window of inferior aluminum cr door wants tall 30% or so. Some wall thickness only 0.6-0.8 mm aluminum profile aluminum door window that makes, pull strength and yield strength are set under the country concerned standard greatly, use very unsafe, cannot because of greedy get temporarily cheap and ignored oneself safety factor absolutely.
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