Features:_x000D__x000D_Made from high quality carbon steel, these corner brackets are durable and solid. _x000D_Surface is plated with nickel for good rust resistance and better performance._x000D__x000D_Widely used to reinforce right angle corner joints of aluminum extrusion profiles. _x000D_There are total 10 pieces of brackets in one pack that you can use for many projects. _x000D_EU-2020, EU-3030 and EU-4040 for your choice to connect different profiles, EU-2020 is for profiles with 6mm slot while EU-3030 and EU-4040 are for that with 8mm slot. _x000D_The EU-3030 is suitable for 3040, so it is marked as 3040. _x000D__x000D__x000D_Specifications: _x000D_Material: Carbon steel _x000D_Surface Finishing: Nickel plating _x000D_Type: EU-2020, EU-3030, EU-4040 (Optional) _x000D_Quantity: 10pcs _x000D_ _x000D_Package Includes: _x000D_10 x Brackets (screws are NOT included) _x000D__x000D__x000D_Note:_x000D_Please note that customers need to match M6 machine screws by themselves._x000D_There may be gaps on each model, which does not mean that there is a problem with the product. It is an interface designed to connect other aluminum profiles._x000D_Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. 1Made from high quality carbon steel, these corner brackets are durable and solid 2Surface is plated with nickel for good rust resistance and better performance 3Widely used to reinforce right angle corner joints of aluminum extrusion profiles 4There are total 10 pieces of brackets in one pack that you can use for many projects 5EU-2020, EU-3030 and EU-4040 for your choice to connect different profiles, EU-2020 is for profiles with 6mm slot while EU-3030 and EU-4040 are for that with 8mm slot