ITEM NAME:1 Inch Underwater Ball Clamp 3 Holes Easy Releasing Mounting and Moving Around Description: The 3-hole butterfly clip design breaks through the traditional style and enhances the use limit of the butterfly clip. The 1-inch ball arm system features 1-inch ball components with a groove and o-ring to prevent slippage for improved holding power with less force. While underwater, clamps may be finger-tightened to keep lighting in place yet allow repositioning without loosening the clamp. All-aluminum alloy hard thickened oxidized surface treatment, more scratch resistant; 304 stainless steel screw spring; wide and large handle, more convenient and easy to rotate, does not hurt the hand. The diving clamp mount for Diameter 25mm ball compatible with arm brands like ULCS, , INON, SEA&SEA... Specification: Material: Durable Air-grade Aluminum Size: 55mm*55mm*62mm(L*W*H) Weight: 65g Package Includes: 1 Piece 3 Ball Holes Mount Clamp SKU: CKX0013809577007806.1 Piece 3 Ball Holes Mount Clamp. The 3-hole butterfly clip design breaks through the traditional style and enhances the use limit of the butterfly clip.