Axler QRA-501S Quick-Release Assembly Sliding Camera Plate | 1/4"-20 and 3/8"-16 Camera Screws Compatible with Manfrotto 501PL Plates | 1/4"-20 and 3/8"-16 Mounting Threads Ratchet-Style Locking Knob | Three Built-In Bubble Levels 3/8"-16 Mounting Screw and Hex Key Includes: QRP-501S Quick-Release Plate (Standard), 3/8"-16 Mounting Screw, Hex Key, Limited 1-Year Warranty, Quick-Release Adapter