Trap extension 1-1/4 inch male x female BSP x 3 inch long.
Extends your wash hand basin waste by 3 inches.
1-1/4 inch BSP thread (standard bathroom wash hand basin waste size.
One end male, the other female.
BSP (British Standard Pipe Thread) sizes don’t match up with what you would measure using a ruler. Have a look at the BSPT link at the bottom of this page for more information about how plumbing threads are measured.