Features:Material: Made of ABS plastic material, which is durable and sturdy.Function: The safety lock is an automatic protection device for the treadmill. When the switch is out of the treadmill sensing area, the running opportunity immediately stops working and emits a beep to protect the user from falling during the exercise.Applicable For: Magnetic suction safety switch for 1.8-2.9cm/0.71-1.14inch electric treadmills with rounded magnetic switches.Easy Use: It is compact, easy to use, and easy to install. When used, the safety lock is placed in the groove of the panel and the other end is clipped on the clothes, which is convenient to operate.Strong Clip: It can easily clamp to any part of your clothing and it& 039;s strong to hold.Specifications:Item Type: Treadmill Safety KeyMaterial: ABS Plastic+MagnetColor: RedSuitable For: Suitable 1.8-2.9cm/0.71-1.14inch treadmillTotal Length: About 1m/39.37inchShell Diameter of Magnet: About 2.8cm/1.1inchDiameter of Magnet: About 1.8cm/0.71inchRed Clip Size: About 2.7 x 5.8cm/1.06 x 2.28inchPackage Includes:1Pc x Treadmill Safety KeyNotes:Transition: 1cm=10mm=0.39inch1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 1-3cm measuring deviation due to manual measurement.