HSS step drill bits are made of HSS steel and coated with titanium to reduce co.ukiction and heat. and and shipped from co.ukom Germany. Includes padded protection, aluminum - Packaging size: 15cm x 10.5cm x 4.2cm (L x W x H). Suitable for all sheet metal work and for deburring metals, non-ferrous metals and plastics. Material: HSS4241 - Durable high-speed steel. Material The HSS step drill is made of high speed steel and coated with titanium to reduce co.ukiction and heat and increase the service life. The three-sided valve stem prevents the bit from slipping The blade features a double-edged design for faster, more consistent cutting. Note: Check the concentricity of the spindle and the collet and the clamping force of the collet. as the runout can cause the tip to break and the hole to become too large. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.