Ring spanner Ring or Box Wrenches: a wrench type used with pressure - very competitive advantages is this kind เหลี่ยมของ bolt wrench handle, and knots. Therefore, pull and push can be very high, but the disadvantage is the use of a wrench, this must be in the proper position to catch the target completely. Features at both ends. A circular ring within the ring is about 6-12 fangs fangs. For use in holding the square nut and bolts firmly.
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