Universal double socket arm mount with two round bases. Both bases have the AMPS hole pattern. The mount is 5.24" tall at maximum extension and is collapsible. Constructed of marine grade aluminum with stainless hardware and black powder coat finish. Rubber ball and socket feature dampens shock and vibration. For most applications, mount will support up to 4 pounds. Comes with mounting hardware. Information HARDWARE INCLUDED: (4) #8-32 x 5/8" Machine Screws (4) #8-32 Stainless Steel Nuts PRODUCT DIMENSIONS: Overall Height: 5.225" SOCKET TO SOCKET LENGTH: 2.5" HOLE PATTERN: 4-Hole AMPS: 1.181" x 1.496" 3-Hole 120-Degree: 1.812" Diameter BALL SIZE: C Size (1.5") WEIGHT CAPACITY: Standard Use: 4 lbs Heavy-Duty Use: 3 lbs MATERIALS: Marine-grade aluminum PACKAGING TYPE: Poly Bag WEIGHT: 0.93 lb Hardware Breakdown RAM® Round Plate with Ball RAM-202U RAM® Double Socket Arm - C Size Short - RAM-201U-B Additional Hardware Locking Knobs for C Size Socket Arms RAM® Pin-Lock™ Security Knob for C Size Socket Arms - RAP-S-KNOB5U RAM® Key Lock Knob with Brass Insert for C Size Socket Arms - RAM-KNOB5LU RAM® Pin-Lock™ 7-Pin Security Knob for C Size and Swing Arms - RAP-S-KNOB5-7U Accessories for AMPS Pattern Base Components RAM® Roto-View™ Adapter Plate - RAM-HOL-ROTO1U RAM® Backing Plate Adapter - RAM-202-225B-2U RAM® Backing Plate Adapter - RAM-202-225B-2U