nstruction, a drill can open a variety of size aperture.
2. do not need to use the center flush, not easy to break. On site construction, one step drill is suitable for a variety of specifications.
3. shaking small, do not need to use the center first to open up a beautiful aperture.
4. use tools: pistol drill, drill can be. Note: while working while water injection cooling, can effectively extend the life of the drill, recommended drilling speed 250-400 turn!
Specification:
Name: High speed steel hex shank step drill 3-13MM
3-13mm 11 layers: (3 4 5 6 7 8 9 10 11 12 13mm)
Weight 25g
Material: high speed steel 4241
Package Content:
1 PCS Step Drill Bit