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Connecting clamps with bolts for large diameter pipes.
Double-sided studs with metric thread cut with a cutter on a lathe.
The worker make a plasterboard ceiling. He does taping plaster drywall ceiling joints. A red plasterboard improve the fire resistance of ceiling structures.
The pile of washer head screw in the light blue scene. The special type for wood material.
Lubrication of the gears of the drive of the drill clamp head.

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