Amazon.com: IMT Tungsten Carbide Tip Scriber 2 Pack, Aluminium Etching Engraving Pen with Clip and Magnet for Glass/Ceramics/Metal Sheet, Extra 2 Free Replacement Marking Tip : Tools & Home Improvement
Mainetti Product details for 5075
M3 Styli: 5mm to 12mm Ball - CMM Technology
Extreme Safety : Carbide Probes® SDS-0600 Hand Held Straight Surface Defect Ball Scriber, Carbide Spherical Ball Tip, Knurled Grip Handle, 5 in L