Extruded Clear Polycarbonate Tubes, 5/16" x 1/4" x 48" Length

.312 Inch Outside Diameter

.250 Inch Inside Diameter

.031 Inch Wall Thickness

Tolerances: Tubes

Cut to Length Tolerances +/- 1/4"

OD Dia Tol +/-.025", ID Tol +/-.025"

They can be machined, drilled, cut and sawed, and is easily joined with solvents and adhesives. UL 94HB

Polycarbonate Tubes are not Pressure or Vacuum Rated

These Polycarbonate tubes are extruded, therefore, they will have extrusion lines, from the extrusion process.
Extrusion lines appear as fine scratching.  They are not as clear as glass or cast acrylic. They also have a blue edge tint. 

1/4" Wall Thickness Tubes (note: larger diameters have heavier extrusion lines, and less clarity.
265° F continuous use temperature. Polycarbonate has a glass transition temperature of about 147 °C (297 °F; 420 K), so it softens gradually above this point and flows above about 155 °C (311 °F; 428 K)

Tubes less than full length (6 Ft) are cut on a band saw, and may have slight burrs, shavings, etc.  Larger Diameters may not be perfectly flat or straight or perpindicular to the length due to blade taper/wandering.