Features:Made of zinc alloy, high hardness, long service life, well oxidation resistances and best performances.Package includes 4 pieces brackets.For installation, insert it into the end joint pit of two profiles, then tighten it with adjusting screws.Widely used in aluminum alloy frame industrial structure building, 3D printer, CNC router, robot engineering.3 profile channel corner joint bracket for connecting 20 30 40 metric series extruded profile rail 6mm t slot frame profile. Package Includes:4x 3-Way End Corner Bracket Connectors Specifications:Material: Zinc AlloySize: Detail Sizes in the Pictures note:Please allow 1-2cm errors due to manual measurement.Due to the differences between different monitors, the picture may not reflect the actual color of the item.