... 4,75 x 7 x 4, etc.2) Bearing Bar Pitch (center to center): 12.5, 15,25, 30, 30.16 ... 16'', 1 1/4'' x 3/16'', 1-1/2'' x 3/16'', 1'' x 1/4'', 1-1/4'' x 1/4 ... '', 1 1/2'' x 1/4 ... ''(19-w-4), (11-w-4), (8-w-4 ... , 100mm are recommended, America standard is available.4) Material: Mild Steel (Low Carbon Steel) ...