Cobalt Jobber Drill Set Imperial: 1/16" - 3/8" x 1/64" Rises | 21pc 66 Drive Links Black finish tools are generally

Black finish tools are generally recommended for ferrous applications where the oxide layer aids chip flow and heat dissipation

a thermal process resulting in a porous tool coating

aluminium alloys materials and yellow metals like copper and brass

They feature a unique cutting edge geometry in conjunction with high temperature brazing to ensure reliable and accurate drilling in multiple hole applications

These tools are best used as deburring tools

Cobalt Jobber Drill Set Imperial: 1/16" - 3/8" x 1/64" Rises | 21pc 66 Drive Links Black finish tools are generallyCobalt Jobber Drills have a Bronze Finish (gold oxide). This metallic brown coloured low temperature temper treatment is used on cobalt tools for identification purposes. Cobalt HSS drills are extremely hard and provide superior performance and increased tool life especially in stainless steel and high tensile steel. Cobalt Jobber Drills Imperial: 1 16" 3 8" x 1 64" Rises 21 Piece Set