مثقاب مركزي، HSS، مجموعة 4 (الأرقام 1-4)

The 60-degree countersink on these drills starts clean without chattering, and the HSS steel handles mild steel well. I needed a #1 for a small clock project and it cut through like butter.

Finally have all four sizes in one set, so I can switch between numbers 1-4 and start a hole on the lathe without hunting for a separate drill. The HSS steel feels solid and the countersink edges haven't dulled after a dozen uses. Getting the exact center each time has made my workpieces sit truer b

These center drills cut cleanly and the combination of drill and countersink in one tool saves me from swapping bits repeatedly. The number 3 size fits perfectly for my spindle work and the HSS holds an edge well through several projects.