Bosch Diamond AutoStart Retractable Centering Pin - HDGPB6

Features:
• Spring-loaded, retractable shaft engages material and maintains contact, allowing walk-free cutting without a pilot hole
• Carbide tip for extremely long life, even in porcelain and granite
• Quick-change universal system for quick changeovers from diamond to bi-metal hole saws
• Unique grind geometry starts holes on the mark, every time