DigitalFoto Solution Limited Horseshoe Clamp Clamps on Flat Surfaces or Cylinders, 1 to 3.1" Diametral Clamping Range, Works with Surfaces up to 2.4" Thick, 4 x 1/4"-20 Threads, 3 x 3/8"-16 Threads CAMCORDERS CONS-Camera & Camcorder Mounts