The support ring for clamping finger clamping fingers pieces 31.01.107 is a wear component used in the bar clamping collet opening and closing group of Gildemeister DMG Mori GS20 and GM20AC multi-spindle lathes. The component is mounted on sleeve 3160202 and works in frontal contact with clamping fingers piece 3101108: during the movement of the control bell, the clamping fingers piece applies its thrust to ring 3101107 and causes the sleeve to move, converting the axial motion of the bell-sleeve group into the kinematic action required to open and close the bar clamping collet. Its main function is to provide a stable and repeatable reaction surface for the clamping fingers piece, ensuring correct force transmission and maintaining the working geometry of the bar clamping system. The component is related to bar clamping collet 9012E for bars with a maximum diameter of 20 mm and bar clamping collet 9017E for bars with a maximum diameter of 25 mm, both used on Gildemeister DMG Mori GS20 and GM20AC multi-spindle lathes. Within the machine kinematic chain, the correct condition of the ring contributes to continuous bar clamping, accurate opening and closing cycles, regular material feed and stable machining on the main spindles. As a secondary component of the machine kinematics, the ring indirectly supports the continuity of auxiliary feeding and clamping systems, the coordination between bell, sleeve and clamping fingers pieces, the correct working sequence of the main spindles and the regular operation of functions connected to radial slides, axial slides and front tool-holder spindles, because excessive clearance or wear in the bar clamping group can affect the stability of the automatic cycle. Wear is visible on the clamping fingers piece contact area and can be identified by the mark or indentation left frontally by clamping fingers piece 3101108. A functional feature of ring 3101107 is that it can be rotated and angularly repositioned, using the different transverse holes before final replacement. The position should be changed when the clamping fingers pieces are replaced and when the ring shows a clear indentation in the contact area. When all available positions are marked or deformed, the ring must be replaced to avoid loss of stroke, irregular contact surfaces, accelerated wear of the clamping fingers pieces and uneven operation of the bar clamping collet. This is a technical spare part for maintenance technicians, overhaul workshops, production departments and specialists carrying out preventive and corrective maintenance on Gildemeister DMG Mori GS20 and GM20AC multi-spindle lathes.