Bronze insert brazed into 1-inch drive bronze tank car socket to size down to 3/4-inch drive. Do not use with impacting tools. Hand wrench only. Limit torque to 300 foot/pounds. Since most 1/2-inch and 3/4-inch drive ratchet wrenches do not have locking pins, excessive force at drive end of socket will strip socket drive. Because bronze is a soft metal, it is spark-resistant, but it also has a shorter service life than steel. Product of Aldon ® Company.