Check the listing for details. ChiaoGoo Tighting Keys - Small/Large, Mini, 4/Pkg. Condition: New. Listed at 8.50 USD. When screwing in your tips, connectors or stoppers, insert this tightening key(s) into the lifeline hole found on each metal join at the ends of your TWIST™ & SPIN™ cables, connectors or stoppers. Simply use the key as a handle to help you grasp and tighten the screw connection. Use the key EVERY time you attach your tips to a cable. For an even better connection, try using our heart-shaped rubber gripper wrapped around the tip with the key. You will need the key to loosen the connection when removing the tips from the cable. Item Number: 2503 or 2503-S/L (fits into our Small [S] and large [L] interchangeable cable lifeline holes). Reduced postage costs for multiple purchases 100% Quality Guarantee & 100% Quality Satisfaction Thank you for checking this item. Any questions please do not hesitate to contact us. ALL OUR PRODUCTS COME DIRECTLY FROM THE WORLD'S LARGEST MANUFACTURER'S & DISTRIBUTOR'S. THEREFORE, YOU CAN BE ASSURED THE QUALITY IS ABSOLUTELY GUARANTEED.