Here below is how to use the Open-ended spanner true:
bolts are still tight should not be loosened with a wrench. Wrench only to bolt loose. If forced, the wrench will be broken ends or the head of the bolt into the round.
The size of the head bolts, wrenches longar will lead angle bolt head is damaged, turn into a round.
The position should be flat.
Picture errors using the wrench uneven position.
Key ring
Key ring is also made from Chrome Vanadium alloy metals. Key ring serves to loosen, remove and install the bolt head or nut tightening torque which has a sizeable and allows to work in a limited space. At the ends of the key head, there are dimensional hexagonal ring (hexagon) or more in diameter hole in it. This key is stronger and lighter than a wrench and give a stranglehold on the entire head of the bolt or nut.
Key ring has a longer stalk than the wrench, lever force is greater than the lever-style wrench. Various key ring:
Single images ring / box ended spanner
Picture Double ring / box ended spanner
Pictures Ring ended slogging spanner