Feature: 1. The main parts are made of aluminum meterial, strong and durable 2. Infinite positioning possibilities can achieve maximum flexibility in your own design 3. Widely used in construction industry aluminum frame structure, very convenient 4. 2-hole placement is designed for vertical joints, very practical 5. Adopt advanced technology with excellent craftsmanship to bring smooth surface, which will not hurt your hands in work Specification: Item Type: Joining Plate Material: Aluminum Surface: Oxidation Purpose: Used for linear extension connection/overlapping connection between profiles Model Length(approx.) Width(approx.) Hole distance(approx.) Thickness(approx.) 2020-2 Hole 40mm / 1.6in 18mm / 0.7in 20mm / 0.8in 4mm / 0.2in 3030-2 Hole 60mm / 2.4in 28mm / 1.1in 30mm / 1.2in 4mm / 0.2in 4040-2 Hole 80mm / 3.1in 38mm / 1.5in 40mm / 1.6in 6mm / 0.2in Package List: 10 x Joining Plate