Features: and .Built-in 2 spirit bubble level, which the photography precisely in horizontal orientation. 38mm Arca- standard U-shaped grooves of the clamp, which can protect your camera from accident . of aircraft-grade aluminium material, processing, hard-anodized surface. Self-euipped with a knob, of all metal, more and non-ageing. Standard 1/4inch & 3/8inch thread screw hole, for any arca style plate, camera bars and multi- rails. such for Arca-, , Markins, , Kangrinpoche, etc. Specifications: Card Slot: 38 mm/1.49 inch Spirit Bubble Level: 2 size: long 70mm Material: Aluminum alloy colour: black Package Contents: 1 x quick release splint clamp Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.