Pre-Drilled Linear Shaft Assembly, System of Measurement Inch, Shaft Diameter 3/4 in, Shaft Length 36 in, Shaft Material Aluminum, Shaft Material Finish Ceramic Coated, Center Height 1.5 in, Rail Base Overall Width 1.75 in, Diameter Tolerance - Maximum -0.0004 in, Support Rail Material Finish Ceramic Coated, Shaft Drilling Pre-Drilled, Shaft Hole Spacing 6 in, Shaft End to Hole 3 in, Shaft Hole Thread Size #10, Support Rail Drilling Pre-Drilled, Rail Top Width 0.375 in