Giottos MH658 Quick Release Adapter (Black) Quick Release Adapter with MH648 Plate Two spirit levels for precise positioning Sliding plate with safety lock 1/4-Inch and 3/8-Inch camera mount screws Base with 3/8-Inch socket with 1/4-Inch bushing Two spirit levels for precise positioning Sliding plate with safety lock 1/4-Inch and 3/8-Inch camera mount screws Base with 3/8-Inch socket with 1/4-Inch bushing Length: 3-5/8-Inch