The 331D three star fine hook stainless steel probe has 10 mil tip and is designed for work under magnification. The overall length is 3". Product Categories: Small Hand Tools - Probes, Scribes, Dotting Pens Body Width x Body Height: n/a x n/a Tip Angle: curve .5 rad OAL: 3" (75mm) Weight: 0.2 Ounces Max per Carton: 12 Country of Origin: Pakistan