4" x 5/8"-11 螺紋 T 型金剛石研磨杯輪

Took down about 40 square feet of old thinset with this and the 7mm segments barely wore down. The 4" size keeps it light enough to run one-handed along a wall, which my arms appreciated by the end of the day.

Screwed this onto my 5/8-11 grinder and it spun true with zero wobble, which I was honestly worried about at this price. Ground down a mess of thinset and old paint off my basement slab and the 7mm segments barely wore down. Cuts fast enough that I had to slow myself down.

The 5/8"-11 threaded arbor screwed right onto my grinder without any wobble, which is the main reason I switched from a blade I had to shim. Cut through a garage floor slab edge pretty quick and the 7mm segments still look barely touched after two jobs.