Model No: NB-H180 Suitable for 22″-32″ LCD/Monitor With air press structure, easy to move up/down Rotate by 360° Tilt up/down：85°/-30° Swivel：180° With cable system to hide the cables Load:2-12kg for each screen (plz make sure your screen within this range, or the gas spring couldnt work ) VESA : 75/100MM Include clamp base and grommet base together: Grommet base suitable for hole diameter 10mm-50mm,desk thickness:20-90mm(if your desk thickness is between80mm-120mm,plz choose the correct option here) Clamp base: desk thickness between 25-80mm Package Includes 1 x clamp base and grommet base together. 1 x Grommet base suitable for hole diameter 10mm-50mm, desk thickness:20-90mm. 1 x clamp base desk thickness between 25-80mm. Model No: NB-H180 Suitable for 22″-32″ LCD/Monitor With air press structure, easy to move up/down Rotate by 360° Tilt up/down：85°/-30° Swivel：180° With cable system to hide the cables Load:2-12kg for each screen (plz make sure your screen within this range, or the gas spring couldnt work ) VESA : 75/100MM Include clamp base and grommet base together: Grommet base suitable for hole diameter 10mm-50mm,desk thickness:20-90mm(if your desk thickness is between80mm-120mm,plz choose the correct option here) Clamp base: desk thickness between 25-80mm Package Includes 1 x clamp base and grommet base together. 1 x Grommet base suitable for hole diameter 10mm-50mm, desk thickness:20-90mm. 1 x clamp base desk thickness between 25-80mm.