Heat treated alloy steel point.Brass body, chrome plated tip.Knurled handle for sure grip.Automatically strikes a surface with powerful spring action when pressed.5”Overall length with a ½” diameter body.Great for punching, screwing holes and starting drilling, screwing or riveting holes.Use this automatic center punch for metal (aluminum, brass, copper), wood, glass, canvas, plastic and leather materials. Also can be used as glass window breaker for occasion or as spring loaded awl for belts and purses. Made of hardened Cr-V steel that holds up to high impact, provides wear resistance, rust proof and strength to prolong the tool’s life.This product is High Performance.Beautifully built with smooth surface stable performance and sensitive reaction.Dont worry, we will provide you with good after-sales service.