Description: It is for Photography, can be used with tripod, rail, stabilizer and different devices Fast switching between different devices without replacing the quick release assembly This item is composed of a quick release clamp adapter and a quick release plate 1/4" and 3/8" threaded holes for mounting; 3/8" Mounting screw for attachment to ball heads Compatible for Manfrotto 501, 500AH, 701HDV, 577, etc Specification: Material: Aluminium alloy Item Size: 12 * 7.5 * 2.2cm Net Weight: 272g Gross Weight: 290g Package Includes: 1 X Quick Release Note: Item Detail: Including 1/4 Screw, 1/8 Screw, Non-slip button, Non-slip Rubber Mat, Locking Handle for Quick Release Plate, Two-way Level, 1/4 Screw and 1/8 Screw Holes