VEVOR Diamond Core Drilling Machine, 200 mm Drilling Diameter, Handheld Dry and Wet Concrete Core Drill Rig with 4 Drill Bits, 1000/2250 RPM 2-Speed, UNC1 1/4-7 Thread, for Concrete Brick Stone, 1500W

4" Drill Bit: Φ102mm; Internal thread 1 1/4-7UNC; flat teeth, tooth depth 12mm; working length 390mm; total length 455mm

The drill bit information included with this product is as follows: 1" Drill Bit: Φ25mm; Internal thread 1 1/4-7UNC; flat teeth, tooth depth 12mm; working length 390mm; total length 470mm 2" Drill Bit: Φ50mm; Internal thread 1 1/4-7UNC; flat teeth, tooth depth 12mm; working length 390mm; total length 455mm 3" Drill Bit: Φ76mm; Internal thread 1 1/4-7UNC; flat teeth, tooth depth 12mm; working length 390mm; total length 455mm