Shaft diameter: 7.8 mm. Forstner bit. Drilling speed: 27 mm. Hole saw length: 27 mm. Depth adjustment: 10 to 50 mm for drilling holes. Mechanical.

Features:1.Newly designed wood drill bit with positioning function; drilling depth can be adjusted from 10 to 50 mm, including five common opening diameters: 15/20/25/30/35 mm.
2.Holes are clean, flat, and free of chipping, with no vibration.
3.Cutting resistance is low, drilling speed is increased, and chips are easily removed.
4.It can be used to drill holes in various types of wood, wood products, plastics, plywood, and other materials.
5.The product is easy to install and use.Simply install it in a standard hand drill.
Specifications:Features:
Newly designed wood drill bit with positioning function; drilling depth can be adjusted from 10 to 50 mm, including five common opening diameters: 15/20/25/30/35 mm.
Holes are clean, flat, and free of chipping, with no vibration.
Cutting resistance is low, drilling speed is increased, and chips are easily removed.
It can be used to drill holes in various types of wood, wood products, plastics, plywood, and other materials.
The product is easy to install and use.Simply install it in a standard hand drill.
Specification:
Material: Carbide
Hole depth adjustment: 10~50 mm
Total drill bit length: 78 mm
Shank length: 27 mm
Shank diameter: 7, 8 mm
Opening diameter: 15 mm, 20 mm, 25 mm, 30 mm, 35 mm
Package weight: Approx.500 g

Package list:
5 * Drill bits
2 * Hex keys