The Dormer Pramet C135 10.0mm HSS-E Flatted Shank 2 Flute Standard Length Slot Drill is a precision two-flute cutter built for accurate slot milling in free machining steel and copper alloys. Designed for workshop reliability, it combines durable cobalt-enhanced steel with thoughtful geometry to deliver clean slots and long tool life.

• Diameter: 10.0 mm
• Number of flutes: 2
• Length of cut: 22 mm
• Overall length: 95 mm
• Reach with neck relief: 54.5 mm
• Shank: Weldon, 10 mm with a flat to prevent slipping
• Material: HSS‑E cobalt-based steel with bright finish
• Helix angle: 30° for efficient chip formation
• Rake angle: 12° to enhance cutting action in softer to medium materials
• Application: Slot milling in free machining steel and copper or copper alloys

Equipped with a cobalt-based HSS-E body, this drill maintains cutting efficiency and wear resistance under repetitive slotting tasks. The 10 mm Weldon shank, paired with a flatted section, ensures secure clamping and steady diameter control in a range of milling setups. The 54.5 mm neck relief provides deeper reach without sacrificing rigidity, enabling clean walls in longer slots and pockets. A 30° helix and 12° rake angle optimize chip evacuation and reduce built-up edge, helping you achieve smooth finishes on copper alloys and free machining steels. This slot drill is ideal for creating precise slots, keyways, and shallow pockets with consistent performance across multiple passes.