They don't get any smaller then this.
510 To 901 And 510 To 801 low profile battery to atomizer adapters in polished nickel plated .
The 510 to 901 will convert your existing 510 e-cig battery or 510 e-cig mod to use a 901/KR808 atomizer or cartomizer.
The 510 to 801 will convert your existing 510 e-cig battery or 510 e-cig mod to use an 801 style atomizer or cartomizer
The only thing visible is a thin polished nickel ring
The 510 to 801 adapter will work on any mod with a flush connector.
The
510 to 801 stealth adapter will not work on mods with a recessed 510
connector unless the recess is wide enough to accommodate the large
diameter of the 801 atomizer.