ドリルセット、115本入り ジョバー長 コバルト鋼

I've been drilling through some really tough hardened steel brackets, and these cobalt bits cut through without any burning or chatter. Having both the numbered and lettered sizes in one case saves me from digging through multiple sets.

The fact that this set goes from 1/16" up to 1/2" by 64ths, plus all the letter and number sizes, means I finally stopped hunting for a random bit mid-project. The cobalt steel cut through some hardened brackets without the tips glazing over, which is exactly what I needed.

Was surprised to find that every single bit from #60 to 1/2-inch is actually included—no gaps in the set. The cobalt steel handles the hardened steel brackets on my old truck without any chatter.