Meet Your Demands: Pre-tinned Holes very handy to solder components and sensors when designing your own for project, project, DIY electronic experiments and other intelligent project. Hole-pitch: 2.54mm/ 0.1in. Hole-diameter: 1mm/ 0.04in. Header Connector: 10 pieces 40 pin male header, 10 pieces 40 pin female header; pitch: 2.54mm, single row connector. Screw Terminal Block: 10 pieces 5.08-301-2P and 2 pieces 5.08-301-3P; pitch: 5.08mm, rated voltage: 300V, rated current: 16A. All PCB universal boards are thick and double-sided, Electroplated holes are pre-tinned, very solid, which makes it very easy for soldering components. Colour: Green+Black Material: Metal+Plastic Package Contents: 20 * Double-sided prototype boards (5 2x8cm, 5 4x6cm, 5 3x7cm, 5 5x7cm) 10 * 40-Pin male connectors 10 * 40-Pin female connectors 10 * 5.08-301-2P Terminal blocks 2 * 5.08-301-3P Terminal blocks 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.