3849b6c8__and_Decker_Drill____GICL_Wiki__Reason_for_Material_Selection
[Part Name] Trigger [Quantity] 1 [Model Number] 17-99 [Description] It is black in color and contains a small trigger lock. [Function] Allows operator to turn the drill on and off and provides speed control. [Material] Consists of plastic and metal components [Reason for Appearance] It is ergonomically designed for comfort and use. [Manufacturing Process] Injection Molding [Reason for Material Selection] 
It is cheap, durable, provides insulation, and it is light weight.
Difference between revisions of "Group 12 - Black and Decker Drill" - GICL Wiki