The Starrett 643 Dial Depth Gage has a knife edge base and a needle point contact which has been hardened and ground. The knife edge base has a cutout so the conical point can be precisely positioned for close work, the point is 1/2in long with a 40-degree angle.

• Hardened, ground needle point contact
• Knife-edge base which can be precisely positioned for close work
• Point is 1/2in (17.7mm) long with a 40 degree included angle
• Case is included