non sparking double open end wrench .5.5*7-65*70mm
Step1) To prepare the raw material, blanking
Step2) Smelting
Step3) 
ouring
Step4) Cut the water gap
Step5) Stored in the semi finished products warehouse
Step6) 
unching
Step7) Through the drawbench or slotting machine
Step8) 
E plain end and chamfering
Step9) Drill hole
Step10) Perfect the product and marking
Step11) If Be-bronze,need heat treatment
Step12) Polishing
Step13) Surface treatment
Double open-ended wrech; a one-piece wrench with a U-shaped opening that grips two opposite faces of the bolt or nut. This wrench is often double-ended, with a different-sized opening at each end. The ends are generally oriented at an angle of around 15 degrees to the longitudinal axis of the handle. This allows a greater range of movement in enclosed spaces by flipping the wrench over
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发表于 2016-10-15 14:01:00
