The spring is thermally deformable at130° to 170° activation time 4 - 5 min.Warning and safety instructions:Please wear heat protection glovesWhen grinding or sawing, please wear respiratory protection and safety goggles. (VE5)small Ø 2.5 mm, approx. 138 x 51 mm large Ø 2.5 mm, approx. 158 x 75 mm