The ATD Tools 11-pc 3/8" Dr. 4-Point SAE Pipe Plug Impact Socket Set, No. ATD-2811, is made of high-quality chrome-moly steel and is heat-treated for strength and durability. The set includes 3/16" 4-Point Male Pipe Plug Socket, 1/4" 4-Point Male Pipe Plug Socket, 9/32" 4-Point Male Pipe Plug Socket, 5/16" 4-Point Male Pipe Plug Socket, 11/32" 4-Point Male Pipe Plug Socket, 3/8" 4-Point Male Pipe Plug Socket, 1/4" 4-Point Female Pipe Plug Socket, 9/32" 4-Point Female Pipe Plug Socket, 5/16" 4-Point Female Pipe Plug Socket, 11/32" 4-Point Female Pipe Plug Socket, and 3/8" 4-Point Female Pipe Plug Socket.