A777 Imperial Cobalt Jobber Drill Bits have a heavy-duty, 135 split point for use when greater heat is generated during drilling, e.g on higher tensile tougher materials and in particular the Aerospace Industry. Specification Flute Geometry Standard Helix, Right hand spiral, Thick Web Point Angle 0.30 mm - 0.95 mm 118 Conical point 1.00 mm to 1.40 mm inclusive 135 4 facet point 1.50 mm and above 135 split point sizes (Split point geometry to NAS 907 Areospace Specification type P3 Point) Surface Treatment Bronze Material HSCo Cobalt steel DIN 338 RN / BS328 / ISO 235 Tip diameter 1/8in. Working length 36mm. Overall length 65mm.