Cast in many industrial products have long been used mortgages (anchor) bolts with special heads, such that not only pull, but rotate can’t.
With the advent of high strength composite self-hardening compositions that bolt you can “lay” in the body of the finished product (plastic or metal) and making it pre-nest, and then simonaityte.
Recommend to read
TURNED HERE, AND TURNED OFF — THERE
There are situations when the lighting is required to manage not one, but two places. For example, when you need to turn on the light when entering in a number of areas on and off when...
HEAT WITHOUT FLAME
Drivers know: after long Parking of the car in the cold to start the engine. At low temperatures freeze even antifreeze! And those who use it for cooling water and drains it at night,...