- Short version - Button and screw in one piece - Easy to install with a 3 mm Allen key - Special self-tapping thread for maximum hold in the wood - Thread diameter: 3.5 mm - Thread length: 18 mm - Hardest steel and double wall thickness for maximum wear resistance and safety - Schaller item no.: 24060400 - Surface finish: black chrome - Includes high quality felt washers to protect the instrument THIS ITEM IS CURRENTLY NOT AVAILABLE YOU CAN CONFIRM THIS INFORMATION BY CLICKING ON ITEM