Sunnen BL4135CH is a BL4 hard-steel mandrel in the Sunnen L Series, designed for honing small to medium bores with precision. It features a 1.875-inch shank length and a reach length of 1.875 inches, plus an abrasive length of 1 inch, and it accepts stone size L4. The mandrel supports bore sizes from 0.135 to 0.140 inches (min 0.135 in, max 0.14 in) and uses a HARD STEEL shoe. Cataloged as BL4135CH, it belongs to the BL4 sub-family within the L Series and is compatible with Sunnen honing systems.
