what's the concept of steel wire spiral shell set?
steel wire spiral shell set (call silk set, spiral shell suit, whorl to expand set too) is a kind of new-type interior whorl fastener, can imbed the metal or forms the high strength on the nonmetallic materials, decreases the standard whorl with interchangeability wear-resisting, can be used for repairing the interior whorl hole worn and torn or damaged. the set of spiral shell of steel wire is with the cold-rolled accurate spiral coil that formed of rhombus silk, interior whorl concentric body, one of its' end have along radial crooked installation handle.

what's the theory of the silk set?
a set of diameter of silk under the freedom state is slightly bigger than its interior whorl packed into, assembling process installation tool is it get torsion to install handle make it is it enclose diameter shrink the elasticity to lead to add, thus introduce and is attacked in the good interior whorl hole with one set of special-purpose screwtaps of spiral shell of steel wire first, put silk set is it similar to spring inflation of function to produce, make fixing spiral shell holing inclusive firm its well, in this way the silk set forms the whorl in a high accuracy which accords with the international standard. can't cause evenly the pitch that the stress is distributed and angle error between the bolt and spiral shell hole, can come balance by spiral shell elasticity of set through steel wire, all spiral their can is it is it carry on one's shoulder or back to impose to share.