The Dormer Pramet C305 is a 28 mm, three-flute slot drill designed for shoulder milling, slot milling, and ramping. Built for professional workshops, it combines robust powder-metallurgical HSS-E with precise DIN 844 K geometry to deliver reliable slots and clean shoulders on a range of metals.

• Diameter: 28.0 mm
• Length of cut: 45 mm
• Overall length: 121 mm
• Number of flutes: 3
• Shank: Flatted Weldon shank, 25 mm
• Material: HSS‑E-PM (powder metallurgical) with bright finish
• Helix angle: 30°
• Rake angle: 12°
• Standard: DIN 844 K
• Applications: Shoulder milling, slot milling, and ramping
• Material compatibility: Suitable for free machining and plain carbon steel, copper or copper alloys, and Fe‑based, Ni‑based, and Co‑based high‑temperature alloys
• Brand/Series: Dormer Pramet Primax

Designed for predictable performance, the C305 balances aggressive material removal with high-quality finishes. The three-flute design supports steady chip evacuation and smooth cutting, while the powder-metallurgical HSS‑E core enhances wear resistance for longer tool life in challenging alloys. The 25 mm Weldon (flatted) shank provides secure clamping for reliable operation in standard DIN 844 K holders. This slot drill is a practical choice for precision slots and pockets across a wide range of metals, helping you achieve accurate dimensions and clean edges with fewer reworks.