A Combination Spanner 30Mm Is A Hand Tool Designed For Fastening Or Loosening Nuts And Bolts. It Features Two Ends: One Is An Open-Ended Wrench, And The Other Is A Closed Ring (Box) End. The 30Mm Size Refers To The Width Of The Nut Or Bolt It Fits, Making It Suitable For Large Fasteners In Mechanical, Automotive, Or Construction Applications. The Combination Of Two Types Of Heads Allows For Versatility, Offering Both The Grip Of An Open-End And The Precision Of A Box-End Wrench.