Cylinder Holder, Steel, 8 in to 8 34 in dia, Silver Black ORS NASCO Exceptionally high impact resistance Exceptionally high impact resistance and large knurled feed screw knob give easy control of cutting pressure for clean cuts Models 117 and 118 include a self feeding AUTOFEED® cutter wheel that automatically cuts after tightening the knob only once Model 118 features a special knob for easier tightening of the feed screw Rubber gasket on the inside of the holder eliminates all concern of friction and noise Holder is hinged and swings back giving you access to the tank much quicker and easier than chains and makeshift methods