The die-cast aluminium body contains a 30m line reel, which passes through a reservoir of coloured chalk (not supplied). It becomes coated as it is reeled out. Snapping the taut line against a surface deposits the colour chalk leaving a visible but temporary line to work to.
The hook has a bent tip and can be stored on the reel's side, which along with the fold away handle allows for neat and easy storage.
Typical applications: plumb lines for hanging wallpaper, marking out cable lines for plumbing, marking out areas for white lining, partitions or stud wall positions, guide lines for cutting timber, roof tile positions etc.