10pcs 1.5mm-6mm M35 High Speed Steel Titanium Hex Twist Drill Bit w 1/4" Shank Bore Timing Pulley Fit for 15 to 18mm

Fit for 15 to 18mm test tubes

Pipe Diameter (ID x OD): 32mm x 39mm / 1

*It is also have addition two characteristics: first

just wipe it slightly

10pcs 1.5mm-6mm M35 High Speed Steel Titanium Hex Twist Drill Bit w 1/4" Shank Bore Timing Pulley Fit for 15 to 18mm1. The hex drill bit is made of M35 cobalt high speed steel with sharp edge. The surface is coated with titanium, which has higher hardness, better wear resistance and longer service life than ordinary drills. 2. 1 4 " hex shank, which can quickly replace the drill bit, eliminates the frustration of the handle rotation on the chuck, and makes it easier to quickly lock to the chuck. It is suitable for most electric hand drills and drilling machines. 3.