Are you still worried about the safety of the treadmill users? This treadmill key can help you solve this problem. Using sturdy material, it is safe and durable. Suitable for professional gym and personal at home use. Easy to use and simple to operate. Features -Color:Red -Material:PP, Aluminum Alloy, Nylon -Size:5.20X2.90X2.80cm/2.04X1.14X1.10in(Clip) -Size:3.00X3.00X2.00cm/1.18X1.18X0.79in(Disc) -Using sturdy material and good craftsmanship, strong and durable for long-serving life. -This safety key is compact size and lightweight, which is very easy for you to install and carry out. -Magnetic safety for electric treadmills with rounded magnetic. -When the is out of the treadmill sensing area, the treadmill immediately stops working and emits a sound to protect the user from falling during the exercise. -This stop key can effectively control the safe emergency stop of the treadmill in a short time. Package list: 2 x Treadmill Locks