Padde's TB38 Smart drop bolt is functionally the same as the TB25, however, the TB38 Smart has a different face plate, body and bolt pin dimensions and is available in fail safe or fail secure.  Also available is Padde's TB32-38 Budget, a cost effective drop bolt.  Available in power to lock only, the TB32-38 has no onboard electronics and unlock and relock times must be controlled by the access control system.  The lock comes standard with a 38mm aluminium face plate, but can be ordered 32mm as well.