The RAM-B-101-A-237PU consists of a short double socket arm, 2.5" diameter round base, 2.5" round PDA stick base and 1" diameter rubber ball, connected to a 1/4"-20 camera thread. The male thread matches most standard camera and camcorder female threads found on the bottom of the camera. The round base contains pre-drilled holes, including the universal AMPs hole pattern. Designed into the mount is a 1" diameter patented rubber ball and socket system with adjustment points at both ends of the socket arm; this with a twist of the arm knob, allows for infinite articulation and optimum viewing angles. Information HARDWARE INCLUDED: (1) 2 7/16" Double Adhesive Pad (1) Alcohol Prep Pad SOCKET TO SOCKET LENGTH: 1.75" HOLE PATTERN: 4-Hole AMPS: 1.181" x 1.496" 3-Hole 120-Degree: 1.812" Diameter BALL SIZE: B Size (1") WEIGHT CAPACITY: Standard Use: 2 lbs Heavy-Duty Use: 1 lb MATERIALS: Marine-grade aluminum PACKAGING TYPE: Poly Bag WEIGHT: 0.35 lb Compatibility COMPATIBLE DEVICES Cameras: that contain 1/4"-20 Female Threaded Hole Hardware Breakdown RAM® 2.43" Diameter Double Sided Adhesive Pad - RAM-202PSAU RAM® Round Plate with Ball - RAM-B-202U RAM® Double Socket Arm - B Size Short - RAM-B-201U-A RAM® Ball Adapter with 1/4"-20 Threaded Post - B Size - RAM-B-237U Additional Hardware Locking Knobs for B Size Socket Arms RAM® Pin-Lock™ Security Knob for B Size Socket Arms - RAP-S-KNOB3U RAM® Key Lock Knob with Steel Insert for B Size Socket Arms - RAM-KNOB3LSU RAM® Pin-Lock™ Security Knob with 7-Pin Pattern for B Size Socket Arms - RAP-S-KNOB3-7U 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 RAM® Add-A-Ball™ Accessory Ball for B Size Socket Arms RAM® Add-A-Ball™ Accessory Ball for B Size Socket Arms - RAM-B-273U