LATHE CUT OFF PARTING TOOL HOLDER & WRENCH With Cut Off Blade ( 1/16" x 5/16" x 3-1/2" ) H.S.S Hardened & Ground Description Fit almost all common tool holders Hardened and ground for Accuracy  Trapezoidal section to fit all standard tool holders Sizes Width Of Blade - 1/16" Height Of Blade -5/16" Length Of Blade -3-1/2"