TEKTRUM EXTERNALLY POWERED SOLDERLESS 1660 TIE-POINTS EXPERIMENT PLUG-IN BREADBOARD WITH ALUMINUM BACK PLATE AND JUMPER WIRES FOR PROTO-TYPING CIRCUIT/ARDUINO 1660 tie points (insertion holes) total: 1260 tie-point circuit area, four 100 tie-point distribution strips providing 8 power rails Standard 0.1" (2.54mm) pitch for easy IC mounting; Externally power connectors; Aluminum rugged back plate Nickel silver alloy pins are pre-stressed, spring loaded and non-corrosive for long term reliability; White plastic body with printed row and column for easy counting Comes with 65 male-to-male jumper wires of various lengths and colors - no need of time-consuming wire making; Breadboard dimensions: 6.5 x 4.25 x 0.3in (165 x 108 x 9mm) Perfect for proto-typing circuit, electronic and electrical experiments without soldering; Works great with Arduino