260 Brass Square Tube Material Brass Inside Height 1/4 in Wall Thickness 0.014 in Inside Width 1/8 in Material Grade 260 Outside Corner Shape Square Mechanical Finish Mill Overall Length 12 in Outside Height 3/8 in Outside Width 3/16 in Standards ASTM B135 Temper H02 to H03 Inside Corner Shape Square Rockwell Hardness 56 to 66 Shape Rectangular Length Tolerance +/-0.032 in System of Measurement Inch