The D size 2.25", holds up to 15 lbs.
RAM 3.68" Dia Round Plate with 2.25" Ball (RAM-D-202U)
RAM D Size Ball Short Length Socket Arm (RAM-D-201U-C)
RAM Medium Length Socket Arm for D Size 2.25" Balls (RAM-D-201U)
RAM U-Bolt Base with D Size Ball for Rails (RAM-D-235U)
RAM D Size Ball Mount with 2 Round Plate & Medium Arm (RAM-D-101U)
RAM Long Length Double Socket Arm for D Size 2.25" Balls (RAM-D-201U-E)
Ram D Size 2.25" Ball On Round Plate with Amps Hole Pattern (RAM-D-254U)
RAM 3" x 11" Rectangle Plate 2.25" Ball (RAM-D-111BU)
RAM 75 X 75mm Vesa Plate with D Size Ball (RAM-D-2461U)
RAM Rectangle Plate with D Size Ball (RAM-D-243U)
RAM® Universal Marine Electronic Mount (RAM-D-115-C)
RAM® Ball Base with 1.5" x 4.5" 4-Hole Pattern (RAM-D-202U-25)
RAM D Ball Mount with Round & Square Plate VESA 75mm and 100mm Hole Patterns (RAM-D-101U-246)
RAM 1.25" to 1.875" Rail Clamp Base (RAM-D-271U-12)
RAM Round Plate 6 Hole Pattern (RAM-D-202U-SYM1)
RAM D Size Ball Mount for Humminbird Helix 9 10 & 12 (RAM-D-202-25-C-202U)
RAM D Size Ball Round Plate for Crown Work Assist (RAM-D-202U-CRO1 )
RAM D Size 2.25" Double Ball Adapter (RAM-D-230U)
RAM D Size 2.25" Diameter Ball Mount with 11" X 3" Rectangle & 3.68" Round Plate (RAM-D-111U-C)
RAM Rail Clamp Base with D Size Ball (RAM-D-271U-2)
RAM Single Swing Arm Mount (RAM-109HS-4U)
RAM® Horizontal Swing Arm Mount with Single Socket Arm (RAM-D-109HS-4U)
RAM® Double Ball Mount with Round AMPS Plate and Large Round Plate (RAM-D-101-C-254U)
RAM Double Socket Arm with RAM Pin-Lock Security Nut and Key Knob for D Size Balls (RAM-D-201-SU)