GDZ510-10
510W/10mm
Lightweight and powerful, more durable
Lightweight 1.2kg 
Fast speed 2900 rpm 
Longer life Longer durability and overload resistance

GDZ650-13 
650W/13mm
Lightweight and powerful, more durable
Lightweight 1.7kg 
High speed 3000 rpm 
Longer life Longer durability and overload resistance