Ultra Spec Cables ST to ST Simplex Multimode or Singlemode Fiber Optic Coupler

Built well, these are pro quality st couplers. Strong, well made. Locked with st cable secure, solid, and sturdy. I didn't even question if this barrel would work or not. If you work a lot with these types of cables you can tell in a second if a product is questionable. No problem with this one. Have to find out where to but replacement dust covers though. They get lost or forgotten about frequently.