These clamps are typically used to organize and protect cables in various applications, such as in electrical installations or audio/visual setups.

Here's a breakdown of the specifications you mentioned:

• One Hole: This indicates that the clamp has a single opening or hole to hold one cable.
• Rubber Feeder: This suggests that the clamp has a rubber component or is made of rubber, which can help cushion the cable and provide additional grip.
• 1/4, 7/8, 1/2 Coaxial Cable: These are likely the diameters of the cables the clamp is designed to hold. The measurements refer to the outside diameter of the coaxial cables.

These clamps are generally designed to be mounted onto a surface using screws or nails and are meant to prevent the cable from moving or getting damaged. If you’re looking for one of these clamps, make sure it matches the diameter of the cables you’re working with and check whether it’s compatible with your mounting setup.