Snap the warmhearted mould material ，Push the drawing association ，Have ideal save energy heat insulation effect 。 Empty the glass composition in adoping ，Effectively lift sound insulation effect 。 It is broad along the trajectory ，Adopt the self-regulation double round composition idle wheel ，Open agilely ，Does not there is not noise 。 The screen window may be packed ，Yarn arbitrary selection outside the inside yarn 。 Yet the colour is designed outside the ones duty ，It is more beautiful 。 Patent produce ，Evoking the lock elasticity is regulateed 。 Outward circle 、The casement respectively compose in the way of one kind of mould material ，The mould material strain is little 、Practise thrift emploing the material 、It is convenient to manufacture 。May fix the utensil drawing raiseing makes to snap the temperature raisies drawing the window 。