Rail Mount Ez-On Diamond Base Adapter The RAP-274-1BU converts all 1 inch diamond base ball mounts into a quick release mount. Attach the RAP-274-1BU to the diamond pattern found on all 1 inch diamond base ball mounts, then transfer your cradle from the EZ-ON/OFF™ Bicycle Mount to your second mount. Hardware Included: (2) #8-32 x 1/2 inch Machine Screws (2) #8-32 x 5/8 inch Machine Screws (2) #8-32 Thin Nylock Nuts Hole Pattern: 2-Hole AMPS: 1.912 inch Materials: High strength composite