機械加工中心角尺組，1 1/2" 與 3"，附劃線針

I was a little skeptical at first, but placing a rod in the V-groove and rotating it 90 degrees gave me a perfect intersection every time. The 3-inch square handled a thicker shaft nicely, and the scriber made a precise mark without slipping.

Used it on some round stock this weekend and the double-line method hit center dead on both 1 1/2" and 3" pieces. The V-groove holds the work snug enough that my scribe lines didn't wander. Solid little set for the money.

The 90-degree trick with the V-groove is dead simple—I chucked a dowel in, scribed two lines, and hit center on the first try. The 3" size handles bigger stock without wobble, and the scriber tip feels sturdy enough for daily use.