Need to machine a precise hole? Add this fluted reamer bit from Dormer to your tool kit. Its spiral design removes chips as you drill and prevents scarring, so cutting is neat and efficient. A long flute length of 31mm and a 7° helix make it suitable for working with thick copper, aluminium and softer types of steel and iron. The straight, cylindrical bit has a 3mm cutting diameter and creates holes to a tolerance of H7, so it's ideal for precision hole-widening jobs.

• Cobalt-based HSS-E bit resists impact and wear
• Steam-tempered finish increases resistance to corrosion and stops metal chips from sticking to the bit

• Construction sites
• Aerospace engineering
• Automotive manufacturing

It has a connection diameter of 3mm, making it compatible with standard rotary tool chucks.

ISO/BS328/DIN206B