Famag Drill Countersink Set with Bit Shank HSS Ø 5 mm Key Features: Brad point drill bit fully ground with two main cutting edges, two taper taps and hexagaonal shank for bit-holder (1/4"; C 6,3). With assembled countersink product line 2100 (alloyed tool steel) For very fast change in bit holders. Drilling and countersinking in soft wood in one single operation. Only limited applicable for hard wood Drill bit: HSS; countersink: alloyed tool steel For hard wood we recommend our brad point drill bits product line 1594 (HSS-G) and countersink product line VARIO 2202. Put the depth adjusting collar 2108.216 directly on the countersink and set the lowering depth 1500 - 2200 rpm. e.g. standard value approx. 1800 rpm in soft wood Specification: Outer diameter: 5mm Shank: C 6,3 Overall length: 86mm Effective length: 36mm