Just to complicate Chaos heres some weights
BRUSH WEIGHTS - Sill brush
So the Vikan is 555gm
Mr Longarm is 540gm
Kingfisher is 530gm
BRUSH WEIGHTS (thanks to Martyn T)
Vikan standard 10" 1lb 1oz / 475g
Vikan hi-lo 10" 1lb 6oz/ 620g
R & W Residential 12.5oz/ 350g
R & W commercial 1lb .5oz/ 450g (with gooseneck as wont come off)
All weights approx as using best guess analogue display kitchen scales (cheap) .
Omnipole Dual trim. Omnipole 30cm double trim which weighs 370gm (just the brush, no jets etc.).