3 Piece 1/4", 3/8" and 1/2" Socket Holders Rail Set Fits most socket designs, and holds both regular and deep wall sockets Rails for 1/4", 3/8" and 1/2" drive Sockets sold separately Capacity: 1/2" drive - 12 sockets 1/4" and 3/8" drive - 16 sockets each Overall dimensions: 14" L x 1" W