excellent design?ABS Plastic Housing, Aluminum Back Plate,Metal Contact Clips; Accept Wire With Diameter 20-29AWG.eliminating the need for welding and saving the assembly time of the circuit. Widely Used?Breadboards can be assembled in fixed units.Used in Proto-Typing Circuit?Electronic?Electrical?Experiments test?robot and Computer Science Class Experiments. Easy to Install?Binding Posts Coded Black, Red and Green, Coloured Coordinates for Easy Component Placement.It is very suitable for the assembly, debugging and training of electronic circuits. Powerful Function?1660 Test Points In Total (including 2 terminal strips 1260 tie-point and 4 bus strips 400 tie-point) and 3 Binding Posts. Excellent Quality?Breadboards are designed and manufactured for solderless experimentation of electronic circuits.It can be used for various electronic components and can be inserted or pulled out at will.