This mounting kit includes a high-quality 2U front plate to install two Shuttle XPC slim PCs in a 19" server rack. Should only one XPC be installed, the unused opening can be closed with a cover plate (2) which is also provided. Feature Highlights Front plate 483 x 89 mm (19" x 2U) 1mm Steel Black Powder-Coated Cover Plate 198.8 x 45.5 mm 16x Screw M3 x 5 mm 4x mounting bracket Shuttle XPC slim Barebones_ DX30, DL10J, DH02Ux, DS61, DS81(L), DH110(SE), DH170, DQ170, DH270, DH310(S), DH370, DS47, DS407(T), DS437(T), DS57Ux, DS67Ux, DS77Ux