The 2.5 mm HSS-DIN338 metal drill features a tapered shank that narrows at the end of the drill bit. Standard drill bits have a constant thickness throughout their entire length. The Thunderweb core is thicker at its narrowest point than a conventional drill core. Parabolic web cross-section: high web density. Reliable durability of the flute geometry – the Thunderweb flute design makes drilling a breeze. Improved heat dissipation leads to a longer tool life. 135° angled cutting edge – precise start, tip does not slip on the material surface. Fine surface reduces friction and extends the life of the tip. Impact-resistant ABS copolymer body with additional rubber corner protection. Withstands higher pull loads and torque rotations, resulting in less breakage. Specifications: Diameter: 2.5 mm, working length: 30 mm, total length: 57 mm, pack quantity: 2.