Feature: 840 Tie points - 128 Groups of 5 connected terminals, 8 Bus of 25 connected terminals. Reusable for fast build a prototype of an electronic circuit - will accept transistors, diodes, LEDS, resistors, capacitors and virtually all types of components - No soldering required - Can modify or revise the circuits easily. Fit for jumper wire of 0.8mm diameter - Standard 2.54mm hole spacing. Adhesive sheet on the back side of the board - Multiple breadboards can be spliced together too. For more details, visit us at http://www.campuscomponent.com/buybulk/breadboard-840-points-pcb-circuit-test-board-white-/97