ITEM NAME:Mirror Box Unit with Shutter Aperture Replacement Kits fit for Nikon D3100 D5100 Description: Mirror box unit with shutter aperture assembly unit repair part. Replacement part for Nikon D3100 D5100 camera. To replace the defective one, make your camera works perfect all the time. Professional skills needed in replacing this part. No need to pay for the high repair fee. Specification: Material: Plastic Product Size: 90*70mm Fit for Nikon D3100 D5100 Camera Package Includes: 1 Piece Mirror Box Unit with Shutter Aperture Note: This Mirror Box Unit without Shutter Assembly!!!.Mirror box unit with shutter aperture assembly unit repair part. 1 Piece Mirror Box Unit with Shutter Aperture. This Mirror Box Unit without Shutter Assembly! Professional skills needed in replacing this part.