Specifications:
The document describes a wire cable reel with a 2.5-meter extension capability. It uses a 2.2mm galvanized steel wire covered with nylon and features a low gradient residually stressed power spring. The spring is designed to slip its fixing on the arbor if the reel rewinds out of control, preventing damage and allowing reconnection on subsequent rewinds. The spring is not annealed at the end and winds onto a large arbor with a diameter of 44.45mm.

Design Details:
The reel includes two holes with a diameter of 4.76mm, a nylon rubbing washer, and an arbor wind with specific dimensions provided in the document. The cable extension is measured in millimeters, with load capacities ranging from 0.5 kg to 3.5 kg.

Applications:
This wire cable reel is versatile and can be used in various applications, such as assisting door opening in tube trains and lifts, as well as counterbalancing hospital x-ray equipment.

Additional Products:
The document also mentions an additional product, a wire cable reel with a 2540mm length and a 1.65mm diameter, made of 4x7 galvanized steel wire with a nylon cover and an outer diameter of 2.62mm.