Rydlo Dremel 9903DM

The Dremel Max Tungsten Carbide Carving Bit 9903DM is a heavy-duty engraving and carving accessory designed for precision work on hard materials. Coated in Titanium Nitride (TiN) and made from hardened steel (HSS), it offers increased durability and cutting performance compared with the standard 9903. The 3.2 mm diameter tip and 39 mm overall length are suitable for shaping, smoothing and grinding a range of materials, and the single-piece design is compatible with Dremel rotary tools.

Advantages

The Titanium Nitride coating extends accessory life up to two times versus the non-coated version and improves material removal, delivering about 20% higher removal rate than the standard 9903. The hardened steel construction provides strength for aggressive applications while maintaining precision for engraving and fine carving. The cylinder-shaped tip enables deep material removal, flat-area cutting, edge rounding and defined V-cuts or stop cuts when used at the correct angle.

Suitable for

• Metal and glass engraving
• Stone carving and shaping
• Removing flash and finishing castings
• Working on hardened steel, cast iron and fire ceramics
• Shaping plastics and hard woods

Key specifications

• Manufacturer: Dremel
• Model / MPN: 26159903DM (9903DM)
• EAN: 8710364082773
• Tip diameter: 3.2 mm
• Length: 39 mm
• Material: Hardened steel (HSS) with Titanium Nitride (TiN) coating
• Maximum speed: 35,000 RPM
• Accessory type: Tungsten carbide carving/engraving bit (Dremel Max line)

How to use

Fit the 9903DM securely in the collet of a compatible Dremel rotary tool. Let the tool and accessory do the work — avoid forcing or pushing hard. For effective cutting and a clean finish, use the sides of the accessory head at an angle less than 90° relative to the workpiece. If the bit chatters rather than removes material, increase the RPM for a smoother cut. Test the result on a scrap piece before working on the final item and refer to any tool icons or video guidance provided with the accessory.

Recommendations

Wear appropriate personal protective equipment (eye protection, gloves and dust mask) and secure the workpiece. Use higher RPM for smoother cutting on hard materials and take light passes to avoid overheating the bit or workpiece.