8 Piece, Tap Socket Set, For Use In Restricted Areas & Is Ideal For Use In Areas Where A T-Handle Won't Fit, Fits All Number & Fractional M.C.T.I. Standard Taps Thru 1/2", Also Fits 1/8" NPT Taps & Metric Taps Thru 12mm Manufactured To M.C.T.I. Standards, Sockets Contained On A Vinyl Holder, Made Of Heat Treated Alloy Steel.