3849b6c8__and_Decker_Drill____GICL_Wiki__Reason_for_Material_Selection
[Part Name] Gear Bracket [Quantity] 1 [Model Number] HKOBIO ZT [Description] Puzzle shaped, bearing for main shaft, slot in side with no purpose, holes to hold different gears [Function] Holds gears together, provides bearing for shaft to spin [Material] Aluminum, steel cased bearings [Reason for Appearance] Holds all components in alignment [Manufacturing Process] Metal Casting [Reason for Material Selection] 
Light weight, high strength
Difference between revisions of "Group 12 - Black and Decker Drill" - GICL Wiki