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Feature

28mm Diameter, especially for battery pen, threaded 510 a-tomizer, pro-tank, a-tty, RDA, RTA, RBA with suitable size
Trapezoidal Design, solid base, not easy to fall over
A portable gadget, help to hold the device upright to avoid oil spilling/leaking
Great way to store & display your various small device while not in use
the metal bases are fairly wide and have good weight to them to keep the tanks from falling over