Heavy duty, corrosion-resistant galvanised carbon steel box spanner. Makes fitting and removing taps easy. Tommy bar holes for extra leverage. Suitable for most brass and plastic tap backnuts 1/2″ and 3/4″. Sizes: 27-32mm. Heavy duty, corrosion-resistant galvanised carbon steel box spanner. Makes fitting and removing taps easy. Tommy bar holes for extra leverage. Suitable for most brass and plastic tap backnuts 1/2″ and 3/4″. Sizes: 27-32mm.