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Twist drill with long shank and specially ground roof-like tip, which can be regrounded easily. Quality according to DIN 7490 and the valid safety regulations. 800 – 2500 rpm, e.g. Ø 10 mm 2500 rpm in formwork panel. Made in Germany
“Lewis” pattern, crest of thread, main cutting edge and taper tap in premium quality. Version with stepped head and hexagonal shank from Ø 8mm.
500 – 2800 rpm. e.g. Ø 12 mm 2000 rpm in soft wood. Further details in the speed diagram
Twist drill, made of cobalt alloyed HSS, acc. to DIN 338, fully ground from the solid. Fitted with a special spiral for good chip removal and greasing materials. Crosswise sharpened acc. to DIN 1412C, point angle 135°, tolerance of diameter h8