These economical VIBRALITE breadboards feature a lightweight construction with 1/8 inch ferromagnetic stainless steel top and bottom skins with an aluminum core to reduce weight. They are an excellent economical choice. VIBRALITE breadboards are thinner and smaller than full-size optical tables, these “mini-tables” are built with the same precision tooling and high quality materials. Furnished with SPILLPRUF tapped mounting holes. Optional, Level-Lok™ tiedowns fasten your breadboard to another surface, enabling you to level your work surface and lock it down. They are available in packages of 4 or 5 Tiedowns.