Diamond-coated sharpener for E-Cut saw blades. User-friendly and handy. Sharpening head holder is 10 mm. Ideally suited for bi-metal blades and can also be used to resharpen induction-hardened blades. With correct handling, the service life is approximately 400 to 600 saw blades. Clamp the drill into the drill holder at 2500 to 3000 rpm, clamp the sharpening head into the drill, and hold the blunt saw blades freehand against the grinding head with light pressure.