Self-Drilling Anchor bolt (SDA) are full threaded hollow rock bolts which used in the drill string during drilling of a support hole, and grouted into the hole.
On any special shape/square/round/smooth material, the bottle cap/bottle body/bottle bottom is no problem. The concave state depth of the bottle bottom is not more than 5 mm, it can be printed well and will not fade.
Now, with the continuous improvement of people's living standards, people eat more and more various foods, including cooked food, stir-fried vegetables, grilled meat and so on.
The fibers, steel armored optic fiber cable, 250μm, are positioned in a loose tube made of a high modulus plastic. The tubes are filled with a water-resistant filling compound. The tube is wrapped with a layer of PSP longitudinally.
To obtain a reliable and huge tightening force, it is necessary to ensure that the clamp ring fixed on the gecko is fully expanded. And the expansion clamp must not fall off the rod or twist or deform in the hole.