catflap.org Online Dictionary Query

  driving sleeves /dɹˈaɪvɪŋ slˈiːvz/
  Rammklötze 
     Synonyms: drop hammers, pile drivers, rams, tubs, drive blocks, drive hammers, jar blocks, jar weights
  
   see: drop hammer, pile driver, ram, tub, drive block, drive hammer, driving sleeve, jar block, jar weight