So You Don't Have The Right Size Socket Handy? No Problem! You Can Use This Set To Adapt The Sizes From: 3/8" To 1/4", From 1/2" To 3/8" , And From 3/4" To 1/2". Just Snap It On And You're Ready To Go.* 3 Pieces In Sets * From 3/8" Male To 1/4" Female * From 1/2" Male To 3/8" Female * From 3/4" Male To 1/2" Female * Sturdy And Dependable