مجموعة قضيب تثقيب، 3/8\" مقبض، HSS

Finally, an 8-piece set that actually covers the smaller bore sizes—the 5/16" minimum bore bars have been perfect for my tight spots. The HSS edges held up through a dozen stainless passes without chattering, and the three length options give me the reach I need.

The 7/16" bars are perfect for opening up wrist pin bores, and having two of them means I'm not swapping tooling mid-job. The HSS holds an edge well even on mild steel, though you'll want to touch them up on a grinder before the first cut.

I've been using the 3/8" shank bars on small aluminum parts and the HSS holds an edge way better than the cheap set I had before. Having both the 5/16" and 3/8" minimum bore sizes in one case means I'm not digging around for the right bar mid-job.