This is a high quality solderless prototyping breadboard. Each row / column has a letter or a number, and there are two double rail power supply strips running the length of the board. Under the board there is a peel-off stip that reveals a self adhesive pad so that the breadboard can be easily secured to a surface.
The board is made of ABS housing with nickel/phosphor/bronze contact clips. The holes in the board have a diameter of 1mm and will accept wire with a diameter 20-29 AWG. There are enough rows for 7 16 pin ICs to be mounted. It has a tolerance of 300V/ 3-5A.
The power supply strips are removable if you need to make the breadboard smaller. Slots on the long edges allow other breadboards of the same type to be securely connected in order to form larger breadboards.
All in all, this is one of the best quality breadboards that we have seen. A must for any proto-typing setup!