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A TCT (tungsten carbide tipped) hole saw cutter is a tool used for drilling large holes in materials like wood, metal, plastic, and even masonry. The tungsten carbide tips provide durability and precision cutting, making them suitable for heavy-duty applications. They're commonly used in construction, plumbing, electrical work, and woodworking.

A double torsion spring is a type of mechanical spring designed to store and release rotational energy. Unlike a single torsion spring, which twists around a single axis, a double torsion spring consists of two coiled springs connected in such a way that they work together to provide more complex and controlled torque.

In its basic form, it usually consists of two coiled segments wound around a common axis, with each segment working in tandem to produce a balanced torque output. Double torsion springs are often used in applications requiring precise rotational movement and are commonly found in mechanisms such as clock movements, mechanical watches, and some automotive components.