Description Material: 65Mn Spring Steel Size: Wire diameter*Out Diameter*Length Internal Diameter =Out Diameter - 2 * Wire Diameter For example ，Size 4.0*30*500 mm，means the wire diameter is 4.0mm,the out diameter is 30mm, the length is 500mm ，the Internal Diameter is 22mm. The Length includes the hook end or loop end. (For all the sizes,we have both hook ends and loop ends .Normallly ,we will send hook ends .If you want loop ends ,please make a note for us.)
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