5 , ▁SD ▁ 5 0 , ▁SD ▁ 7 0 , ▁SD ▁ 2 5 0 , ▁SD ▁ 5 0 0 , ▁SD ▁ 1 4 0 0 , ▁and ▁SD ▁ 1 7 0 0 . ▁The ▁number ▁in ▁the ▁bomb s ▁design ation ▁correspond ed ▁to ▁the ▁approximate ▁weight ▁of ▁the ▁bomb . ▁ ▁The ▁SD ▁series ▁was ▁used ▁primarily ▁in ▁two ▁roles ▁that ▁were ▁determined ▁by ▁the ▁type ▁of ▁fu ze ▁and ▁access ories ▁fitted ▁to ▁the ▁bomb . ▁The ▁first ▁was ▁as ▁a ▁fragment ation ▁bomb ▁with ▁instant aneous ▁fu ze ▁and ▁when ▁the ▁bomb s ▁expl oded ▁above ▁ground ▁the ▁case ▁created ▁large ▁fragments ▁which ▁would ▁kill ▁enemy ▁personnel ▁and ▁destroy ▁un arm ored ▁vehicles . ▁ ▁The ▁second ▁role ▁was ▁as ▁a ▁general - pur pose ▁or ▁arm or - p ier cing ▁role . ▁In ▁this ▁role , ▁the ▁bomb s ▁were ▁fitted ▁with ▁a ▁time ▁delay ▁fu ze ▁which ▁det on ated ▁the ▁bomb ▁after ▁it ▁had ▁pier ced ▁a ▁target ▁destroy ing ▁it ▁with ▁a ▁combination ▁of ▁its ▁bl ast ▁and ▁fragments . ▁ ▁Design ▁ ▁The ▁body ▁of ▁the ▁SD ▁ 5 0 ▁was ▁of ▁one ▁piece ▁cast ▁and ▁mach ined ▁steel ▁construction . ▁ ▁The ▁body ▁had ▁one ▁trans verse ▁fu ze ▁pocket ▁just ▁forward ▁of ▁the ▁horizontal ▁carrying ▁lug . ▁ ▁Ar ound ▁the ▁nose ▁of ▁the ▁bomb ▁there ▁was ▁often ▁a ▁kop fr ing ▁- ▁a ▁metal ▁ring , ▁tri angular ▁in ▁cross ▁section , ▁designed ▁to ▁prevent