2 eyepiece covers, inner diameter 32 mm Binocular rubber eyepiece eye covers 2 for 31-33 mm stereo microscope eyepiece eye covers. | Foldable flat-edge eyepiece. Inner diameter 33mm (where it connects to the viewing end of the lens). | This model is foldable and suitable for 31-33mm microscope eyepieces, telescopes and other lenses (more suitable for wearing glasses, more comfortable). | The eyecup is made of rubber. Rubber is elastic. So in addition to looking at the inner diameter of the eye, you should also consider the rubber, which is elastic and can stretch. | Soft rubber can be folded. Easy to use. Durable and practical.

Package includes: 20 pcs hard drive shock absorbing screws | Requires chassis support, some power supplies will work, laptops will not work. | Size: total length 11.3mm/0.44inch, cap thickness 1.47mm/0.05inch, light pole length 4.83mm/0.19inch | Easy to install convenient and practical, suitable for all 3.5 inch hard drives. | Applied to chassis support to provide good silence and damping effect.

Product name: 24-pin ATX power on/off.Wire model: 1007-18awg. | Female patch cord length: 50cm / 19.69inch.Interface: Standard ATX 24Pin female plug.Color: red, black. | The 20/24-pin ATX/EPS power switch cable allows you to easily turn the ATX power on and off. | The red light-emitting diode indicates the status of the power switch. | Suitable for testing PC power supply or other related components.

PC case internal motherboard speaker alarm buzzer. | Application: The sound emitted by the buzzer is used to determine the working status of the motherboard. It is easy to install and compatible with plug-and-play, making it very easy to install on the motherboard | Wiring: Red is positive and black is negative (actually, as long as the interface connects to the speaker, both positive and negative poles can be used) | How to use: After turning on the computer, we will hear the familiar ¡°beep¡± sound, which usually indicates that the computer is working properly, and the sound comes from this buzzer. If there is an abnormality, you can determine the fault through the sound | Package includes 4 pcs/computer case buzzers, black, with specifications of 12x8.5 (mm)