ChromLives Magic Arm 7" Articulating Friction Arm Super Clamp Adjustable Rod Clamp Pliers Clip with 1/4" and 3/8" Thread for DSLR Camera Rig/LCD Monitor/LED Lights/Flash Light (Camera Bracket) Aviation aluminum,made in China Specifically designed for Nikon D3/D3S/D3X 39mm AS standard interface,weight is only about 125g