High speed steel drill bits, with 7pcs.
The Shank of the stainless steel drill is 1/4" inch.
Suitable for wood window or door tapping.
Fast replacement composite cone, uses drill edged principle.
Drilling and tapping, high working efficiency.
High hardness, rustproof, solid and durable.
Positioning accuracy, will not shift,the chips automatic discharge from either side of the top of the drill hole , don't stuck drill.
The bits are surrounded by spring loaded guides that have a widow to show the drill bit depth while making adjustments.
Good tools for carpentry DIY or professional engineers.
Diameter of holes
5/64": Hole cutting diameter is about 2mm, for 2.2 – 2.8mm tapping screw.
7/64": Hole cutting diameter is about 2.8mm, for 3.0 – 3.5mm tapping screw.
9/64": Hole cutting diameter is about 3.5mm, for 4.0 – 4.5mm tapping screw.
11/64": Hole cutting diameter is about 4.5mm, for 5.0 – 5.5mm tapping screw.
5MM: Hole cutting diameter is about 5mm, for 5.5 – 6.0mm tapping screw.
13/64": Hole cutting diameter is about 5.1mm, for 5.6 – 6.1mm tapping screw.
1/4": Hole cutting diameter is about 6.3mm, for 6.8 – 7.5mm tapping screw.
7pcs Self-centering Drill Bits