[Part Name] Clamshell set [Description] Used as a housing for the components of the jigsaw [Manufacturing] The Housing is made using plastic injection molding. [Reason for Using Materials] Plastic is used because its easy to mold and also easy to create spots to fit components in [Forces Applied] The user applies force on the handle to keep the jigsaw in place and to guide it. [Functional/Cosmetic] This part is functional and cosmetic as it bears the name plate and company logo and houses most of the components. [Quantity] 2 [Complexity] 1 [Reason for Shape] 
The plastic is molded in such a way that the user feels comfortable handling and operating the jigsaw.