Hexagon wrench or wrench L (Alen or Hollow set-screw Wrench) wrench used for สลก spiral acting Bobblehead central to hexagonal hole. Which is used for special, such as bolts, adjust the target (set-screw).On the hexagon and hardened to form L size both end sides and standard size เท่ากับรูท head bolt torque twist relative to do so One must be careful to use the wrench L is the fit of the strength.Screw must not be damaged with spiral
.Combination wrenches
.
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