Excellent quality, powerful R & D capabilities, thoughtful after-sales service are actually not only the consistent philosoph

A Flat Folding Door Handle:$2.10,

A Gear box:$2.25,

2 Bolts:$0.03*2=$0.06

2 Sockets:$0.03*2=$0.06

A Door Handle with lock core(lock body):$10.30,

Cost of the Aluminum Section Bars=Weight of Aluminum(calculate with long and height)X(Aluminum Ingot+processing fee)(excluding spray price & packing charges) 

Folding Door Fittings