Are you still worried about the safety of the treadmill users? This treadmill key can help you solve this problem. Using plastic, alloy and rope material, it is safe and durable. Suitable for professional gym and personal use. Easy to use and simple to operate. Features -Color:Black -Material:Plastic, alloy and rope -Size (red part):3.20X3.20X2.50cm/1.26X1.26X0.98in -Size (black part):4.30X2.80X0.50cm/1.69X1.10X0.20in -Manufactured with anti-wear plastic, alloy and rope material, sturdy and practical for a long use. -More convenient, It can easily clamp to any part of your clothing, and it's also firm to hold. -This treadmill safety key is an important device that protects owners and user from injury by not allowing the treadmill to run without the key attached. -This safety key is suitable for most kinds of running machine on the market, and you can use it with confidence. -The treadmill safety key is an important device that protects the owner and user from injury by not allowing the treadmill to operate without a connected key. Package list: 1 x Treadmill Lock