Diameter x working length x total length: 4.2 x 78 x 119 mm, according to DIN 340 Right-hand spiral drill bit type N, self-centring 135° drill bit with diameter tolerance h 8, cross cut according to DIN 1412 C It is our aim to develop appropriate accessories for more efficient working The research and development departments at Bosch work to develop and optimise accessories in line with the needs of users The research and development departments at Bosch work to develop and optimize accessories in line with the needs of users As a leading manufacturer for power tools accessories, Bosch offers the ideal accessories for virtually all applications Precision ground professional drill bit for fast drilling progress with low contact force without pilot or pre-drilling, with extra long working length. Use of universal cutting oil 2607001409 recommended.