This SUTTON TOOLS PD01 TCT Pilot Drill Bit supports the SUTTON TOOLS DA01 Holesaw Arbor.
Used together, they support the SUTTON TOOLS H115 Diamond Grit Holesaw range.
Specifications

Diameter: 8.0 mm
Length: 63 mm

For use with

SUTTON TOOLS Holesaw Arbors

H115DA01 – Holesaw Arbor for 19-29 mm H115 Series Holesaws

SUTTON TOOLS H115 Series Diamond Grit Holesaws

H1150190 – 19 mm
H1150220 – 22 mm
H1150250 – 25 mm
H1150290 – 29 mm