Ski Drill 4.1 X 7.5mm T.I.N Coated

Ski Drill 4.1 X 7.5mm T.I.N Coated

T.I.N. coating increases the hardness from Rockwell 62 to Rockwell 82. It also increases lubricity by 35%, giving a much smoother, cooler-running bit. The bottom line is that the life and sharpness of the drill bit is easily doubled.