Tien-I straight box wrench (tube box spanner) have two openings in the top and bottom, which is designed to match and go through by special cylinder rods (Tommy Bar). The user can rotate the nuts easily. Even though the user don't have this kind of tools near around, something like screwdriver still can be replacement. This is definitely much easier than turning around the nuts by hand or by pliers with risk of damaged nut.
Step by step to use our box spanner (tube wrench)：
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