This is a a high grade very low loss BNC to SMA adapter.
Features
• flat response
• excellent VSWR
• low cost adapters, available from stock
• brass body, nickel plated
• Insertion Loss: 0.02 dBi @ 433MHz
• Insertion Loss: 0.04 dBi @ 900 - 1300MHz
• Maximum operating frequency 2.0GHz