The spring is thermally deformable at 130ø to 170ø activation time 4 - 5 min. Warning and safety instructions: Please wear heat protection gloves When grinding or sawing, please wear respiratory protection and safety goggles. (VE5) small ? 2.5 mm, approx. 138 x 51 mm large ? 2.5 mm, approx. 158 x 75 mm