12 Piece SetDrive: 3/8"Sizes Included: 1/16", 5/64", 3/32", 7/64", 1/8", 5/32", 3/16", 7/32", 1/4", 9/64", 5/16" And 3/8" Comes With Socket Rail To Store Sockets, Rail Can Be Mounted To A Wall Or ToolboxHeat Treated Socket Bases For Durability And ServiceabilityNot For Use With Pneumatic And Electric Impact Wrenches