2020 T slot Aluminum profile 3-way corner bracket. High strength and hardness Durable in use Suitable for connecting, at the specified angles, aluminum T-slot framing profiles of 20 metric series. The fitness of the connector depends from the shape and wall thickness of the aluminum profile. If tight, you can use a plastic hammer to fit it. size:20x20mm Material:Aluminum alloy colour:Silver Package Contents: 4 x 2020 T Slot 3 Way Corner Joint Brackets(Black) 16 x Screws Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.