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Handle reverses for double the brush life.
-Steel back is crimped permanently to the durable composite block that won't warp or crack.
-Steel swivel socket is riveted through the entire block, allowing handle to be reversed again and again without stripping threads.
-Polypropylene bristles resist wear, grease, chemicals, acids and alkalis.
-Handles, sold separately, have metal threaded stud end.
You can always remove it later.
Found on page 0955 of Source Book 2009 Spring/Summer