Check the listing for details. RAM-D-111-C-KNOB9H RAM Large Marine Electronics Mount with RAM H.... Color: Black, Condition: New. Listed at 176.49 USD. RAM Large Marine Electronics Mount with RAM H... RAM-D-111-C-KNOB9H Genuine RAM Products! hardware included (4) .312 INCHES x .187 INCHES Shoulder Washersproduct dimensions Overall Length: 8.125 INCHES socket to socket length 3.6 INCHES hole pattern See Drawingsplate size Top Plate: 3 INCHES x 11 INCHES Bottom Plate: 3.68 INCHES Diameterball size D Size (2.25 INCHES )weight capacity Standard Use: 6 lbsHeavy-Duty Use: 5 lbsmaterials Marine-grade aluminumpackaging type Retail BoxWeight 4.1 lb product dimensions Overall Length: 8.125 INCHES socket to socket length 3.6 INCHES hole pattern See Drawings plate size Top Plate: 3 INCHES x 11 INCHES Bottom Plate: 3.68 INCHES Diameter ball size D Size (2.25 INCHES ) weight capacity Standard Use: 6 lbsHeavy-Duty Use: 5 lbs materials Marine-grade aluminum packaging type Retail Box Weight 4.1 lb