... Up and down synchronous precision of double belt: frequency conversion moment synchronization12)Synchronous gear modulus of double belt:M513)Diameter of ... block thickness specification:40mm,50mm ,75mm ,100mm17)Supply 50mm,75mm every one set for roof side module, supply bottom module one ... set,supply 50mm, 75mm, 100mm every one set for wall module;18)chain section distance of ...