1, Adaptors crossover coupling for dimond core drill bits 2, All kinds of types Adaptors crossover coupling for dimond core drill bits1, Convenient fast change ... kinds of thread adaptors or connections in 1-1/4"UNC, 1/2"BSP,5/8"-11, M14, M16, M42, CRI28 ... Korea.4, Packaged by paper box, carton, plywood case and pallet.5, Other sizes can be provided upon request. Adaptors crossover coupling for ...