When processing large surfaces of metal or wood with sandpaper craftsmen have to attach it to various devices. We offer original clasp allows you to do this conveniently and quickly. It is a kind of wooden “book” with the “dust cover” of the skin, the ends of which are filled inside and securely fastened when closing with two rows of sharp Shura stand or studs. “Binding” is the piano hinge.
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SECRET SCREW
If the head of the screw to give with the help of nalilsya the form shown in the figure, then any attacker will not be able to turn. On such hardware it is recommended to set sensible...
SIREN FOR MODEL
The device is useful for a model fire truck and a guard system. The intervals between the signals and their duration is controlled by changing values of electrolytic capacitors C1, C3,...
