Boeray 4pcs 5-Hole 90 Degree L Shape Outside Joining Plate for 2020 Series Aluminum Profile, Joint Bracket Plate Quantity:4pcs; Material:high quality aluminum alloy,finish: oxide; Hole diameter: 5.4mm,thickness: 3.6mm,use M5 screw and nut; Dimension: 60x60x3.6mm/2.36x2.36x0.14(see the picture); Used for: connect aluminum profile 2020 series 3D printer frame;