Trap extension 1-1/2 inch male x female BSP x 3 inch long.
Extends your waste fitting by 3 inches.
1-1/2 inch BSP thread - standard kitchen sink 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.