Skip the messy compounds—these bobs come embedded with aluminum oxide, the most common abrasive material. Best for polishing steel, they’re also a good all-purpose option for other materials when specialty bobs aren’t available. Use them to polish small areas and hard-to-reach spots with a drill or grinder for bits and burs. Grit is approximate.

Pop these rectangular bobs onto a reciprocating polisher to glide along flat surfaces—no messy compounds required. They're embedded with silicon carbide abrasive, which stays cool to prevent buildup. That makes them best for soft metals prone to clogging, such as aluminum. The abrasive also lets you cut fast without pressing hard. Their flat profile suits both large surfaces and straight, narrow spaces. The bobs have a beveled tip to polish on an angle. Grit is approximate.