4 Piece impact grade adapter and reducer 1/4” (F) to 3/8” (M), 3/8” (F) to1. 1/4” (F), 3/8” (F) to 1/2” (M), 1/2” (F) to 3/8” (M). The impact adapter reducer set is rust-proof Manganese Phosphate coating for durable performance job.