Material: HSS Drill ; black chamfer drill body material: steel
7 piece sizes sizes 3mm(0.12"),4mm(0.16"),5mm(0.20"),6mm(0.24"),7mm(0.28"),8mm(0.31"),10mm(0.39")
Special designed steel counter sleeve countersinks or counter bores pilot hole.
Drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew.
It is suitable for drilling machines with chuck, for drilling on hard wood or wooden floor.