The Sink and Tap Back Nut Kit (GRIP4625) includes 8-13mm monobloc (3240U) and 27x32mm box spanners (319U) for most kitchen and bathroom taps.
Also included is the Shorty Handle Basin Wrench (4357G) and of course the Grip+ fittings which connect the head of the Basin Wrench to the box spanners.
This allows for extended reach, access, and leverage for the box spanners.
The kit also contains a 3-prong tool for holding a sink rose/ strainer whilst fitting the waste nut with a 50mm box spanner.