These are the sizes that normally don't come in any of your 'tool kits' (they only usually go up to 19mm) - generally useful to have around and covered by lifetime guarantee.
On Clearance so won't last long, you can check stock on line but can get this price without reserving on-line (might need them to scan it)
Halfords Advanced Professional Combination Spanner Set 4 Piece is made from fully polished chrome vanadium steel for superior performance and is an essential set for any workshop or garage.
* 12point surface drive avoids rounding on corners - provides up to 25% more torque on the fastener without rounding the corners by driving on the flat surfaces
* Offset open jaw for greater access
* Includes: 20, 21, 22 and 24mm combination spanners