Hilti X-Change Module DD-X 112 LM 112mm Diamond Core Drill Concrete Bit 2088621. Diamond Core Drill X-Change Module. Concrete and reinforced concrete core drilling. Suitable for Hilti DD core drilling systems. X-Change quick replacement module for efficient diamond core drilling performance. 1 Core Drill Module. New and unused surplus stock. Item location: LS10 4EP. We are not VAT registered. VAT invoices are not available.