- Square type fenders are used for tugs,barges, workboats and pilot boats as side belting and protective fenders against heavy rubbing, brushing and pushing forms. These D type fenders display a higher energy absorption capacity, thus minimizing deface contact. These fenders can also be mounted quay are by means of anchor belts. Square type fenders are supplied with D hole Rounded hollow or solid. Long length Square fenders can be supplied to match the Aft or Bow radius.