<li>Construct: be made of bottom and cover, there are thread holes in the bottom
<li>Color: white, black, gray, and so on.
<li>Work temperature: -25degree-75degree, 85degree of standing high temperature
<li>Using method: fix the bottom first, put thread in it, then cover
   
Specialty:
<li>Combined strongly, no taking off, smoothness of  the surface, no hurting hands and mangling the thread nearby.
<li>Hard to break, color changing, distortion under the temperature of 70 degree
<li>Low thread hole, easy combination, take down simply, easy wiring, solid
<li>No thread hole and airproof, dust protecting, mouse protecting, suit to construction and factory