This Vaunt3 Piece Bi-Metal Impact Holesaw Set has been designed for easy cuttingand built to last. The 0.6mm thin walls allow for less resistance and strain on tool motors, prolonging your tools battery life. The 10.5mm shallow cup designed for thin materials is made from 8 cobalt for extra strength, longer lifeand greater heat resistance. Complete with a 14 quick switch hex shank that allows you to quickly switch from chuck to driver to holder with easeand speed