10 HSS-CO Sverlo 4mm Bosch 2608585880 is a 4mm-diameter of 4mm diameter made of high quality HSS (High-Speed ​​Steel) and cobalt. This tool is perfect for drying metal, plastic and ceramics, including hard materials. This Sverlo, produced by Bosch, provides high performance and longevity results. HSS-CO outfit, high-speed processing shows perfect resistance to high temperatures and wear. This is the ideal choice to open this Sverlo, accurate and clean holes in the size of 4mm. Suitable for professional and home users and offers the perfect perfection performance in various hard materials.