D'Andrea's MAS 403 BT is part of the company's Toprun ER Series of balanceable toolholders. Models of the product line are integrated with 2 counterwieghts in the graduate grooves. These counterweights are to be oriented via the indications provided by the electronic balancing units. The systems feature tie-rods and tools, compliant with international ISO 1940/1 standards. They also sport enhanced levels of accuracy and surface finishes. For machining applications of up to 8,000 rpm, the apparatuses must be oriented at 0° and at 180°.
The MAS 403 BT Toprun ER Toolhandlers are designed and manufactured for allocating their body masses, in order for them to rotate without creating centrifugal forces above a fixed limit.