Automatic Center Punch (Pack of 5) Heat treated alloy steel point. Brass body, chrome plated tip. Knurled handle for stable grip. Start or mark holes for drilling, screwing, and riveting. Automatically strikes surface with a powerful spring action when pressed. | 5" overall length with a 1/2" (12.7mm) diameter handle (per punch) US-BASED CUSTOMER SERVICE: Available by chat, email, phone, or visit us at our customer service center in La Crosse, WI.