McMaster 99612A164 Steel Left Hand Thread Thin Profile Hex Nut, Pack of 10, Medium Strength, Zinc Plated, 3 4" 16 Thread 10004840 Impact (I) Shank Material (PRINT) Impact (I) Shank Material (PRINT) Nylon Liner Technology GORE TEX(R) Upper Material (PRINT) Leather Insulation Technology Not Applicable Midsole Material (PRINT) EVA Maximum Heat Rating Not Applicable Insole Material (PRINT) Polyurethane Metatarsal Guard (PRINT) No Liner Material (PRINT) Synthetic Fabric Puncture Resistant Sole (PRINT) No Toe Cap Material Composite Ninety Degree Heel (PRINT) Yes For Use With Saw Type Jig Saws Item Jig Saw Blade Set Primary Saw Application Wood Material Bi metal Teeth per Inch 10 Medium strength SAE Grade 5 steel hex nut with zinc plating and left hand thread for use where right hand threaded nuts could loosen South Korea