Long lines or wires for anchoring various types of poles or tension fencing nets can be tightened using the so-called. turnbuckles. In such bolts, the two hook ends of the bolt have different threads – left and right. Turning the central part of the turnbuckle causes the ends to screw in or out at the same time, thereby tightening or loosening the cable. With such a turnbuckle, we can very tightly, even with your hand, tighten the line or wire and it is very easy to loosen it by turning it in the opposite direction.