Description:                                                                                                          

1-HIGH QUALITY MATERIALS:Made of classic high speed steel 4241 and Titanium coated to reduce friction and heat. Easily cut through steel sheets, aluminum sheets, copper & plastic & wood board and many other types of sheet metal with ease.

2-TWO-FLUTE DESIGN:Double cutting blades design gives you faster and smoother cutting, automatically deburrs when drilling holes.

3-1/4 INCH HEX SHANK:Fits into power tools chuck securely and eliminates slip. Widely used to cut holes in a variety of material like steel, wood, thin iron, aluminum alloy,PVC that the thickness is within 5mm

4-WORKING PERFORMANCE:Suitable for drill, bench drill. Water Cooling during work can effectively extend the service life of step drill bit, recommend drilling rate of 250-400 RPM.

5-STEP DRILL BITS SET:Package includes 3Pcs straight flute step drill bit with size 4-12mm, 4-20mm, 4-32mm. 1/4" Hex Shank.