12.3mm Titanium Coated M42 High Speed Steel 8% Cobalt (HSS) Twist Drill Bit 7.6 Inch 2pcs x Pipe Support with

2pcs x Pipe Support with Mounting Parts

Brush greatly reduce the infiltration of light

4 inch(D*T)

Overall Size: 36

Surface electroplating treatment

12.3mm Titanium Coated M42 High Speed Steel 8% Cobalt (HSS) Twist Drill Bit 7.6 Inch 2pcs x Pipe Support withM42 steel is a super hard cobalt high speed tool steel containing 8% cobalt, with good toughness, high wear resistance, high cutting efficiency, and good hot hardness (Retains hardness even at high temperatures of the cutting edge.). Nanoscale gold titanium coating can apply lubricant better for smoother drilling and is more durable and corrosion resistant. Can greatly improves hardness, wear resistance, and reduces the coefficient of friction. Sharp