Version:
Exactly central ground point. Easy spot drilling and high shape accuracy of the centre hole. Sturdy due to short flutes.
Extra long version.
Application:
Point angle 142° so that the cutting edges of the following twist drill engage easily.
Note:
Use the speed for the actual hole ⌀ (not generally the speed for the drill outer ⌀).
Form HB and HE supplied at the same price as HA.
Form
HB: order with
No. 121120.
Form
HE: order with
No. 121121 + 129100 HE.