Longer mould , two mould work at same time.the distance of pin center reach 650mm .it has 139 pins for SS16 (3.8mm). Features:1. This machine is suitable for grind & polish kinds of rhinestone and flat back rhinestone and hollow bead (hollow rhinestone) which it is smaller than SS30(6.6mm).2. Longer mould used, the distance of pin center reach 650mm, it has 139 pins for SS16 (3.8mm), and two ...