Nerrad NT631003 Monoblock Box Spanner Set 

• THREE PIECE DOUBLE ENDED SPANNER SET DESIGNED FOR USE ON MONOBLOC TAP BACKNUTS
• SIZES, 8/9mm, 10/11mm, 12/13mm.
• INCLUDES TOMMY BAR FOR ADDED TORQUE
• LONG REACH FOR ACCESS IN RESTRICTED AREAS
• CORROSION RESISTANT SATIN CHROME PLATED
• 5 YEAR WARRANTY