SUTTON TOOLS D188-Series Reduced Shank Drill Bits are designed to increase the drilling capacity of drill chucks for slow speed (350 RPM or less), large scale boring.
Features

Reduced Shanks – Suits 13mm drill chucks
118 Standard Point – For general purpose applications
Made from M2 High Speed Steel (HSS) – Offering the best combination of strength, heat & wear resistance
Blue Surface Finish – For ferrous applications – The steam oxide finish prevents chip build-up on the cutting edges and reduces cutting friction, especially in low carbon steels

Specifications

Length (Overall): 152 mm (6″)
Flute Length: 86 mm (3-3/8″)
Reduced Shank Diameter: 12.5 mm
Point Angle: 118 Standard

Includes

D188-Series Reduced Shank Drill Bits (x4):

16.0 mm
18.0 mm
22.0 mm
25.0 mm