Features:Brand new and high quality.
High Speed Steel, Titanium Nitride Coated.
1/4â€ť Hex shank for quick chang and sure grip.
Tri-flat shank for sure grip.
Self-starting tips will not skid , no need for center punching or pilot drill.
Material: High speed steel.
Include Sizes:1: 4mm to 12mm 9 Steps (4mm,5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm),7cm(L).
2: 4mm to 20mm 9 Steps (4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm),7cm(L).
3: 4mm to 32mm 15 Step(4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm,22mm,24mm,26mm,28mm,30mm,32mm),10cm(L).
Note:When drill the hardness and larger diameter hole,must cooling the bit with cool water,recommend the drilling rate for 120-240 is suitable for processing 6mm and below plate,the bits are high speed steel material,drilling rate are 120/minute,expanding to more than 20 mm hole,drilling rate shall not be higher than 400 RPM and used water cooling.
Package Included:3 x Spiral Grooved Step Drills
NO Retail Box. Packed Safely in Bubble Bag.