The "Swiss Grater" will have larger vent holes and will come with a Melonite coating instead of the traditional Manganese Phosphate coating on the Standard Models. THE ULTIMATE SH-T HITS THE FAN ACCESSORY FOR YOUR KRINK... THESE WILL FIT MOST RUSSIAN & BULGARIAN KRINKOV SERIES RIFLES/PISTOLS (THESE WILL NOT FIT THE YUGO M85/92 PISTOLS (*PICK YUGO LENGTH) OR ROMANIAN DRACO PISTOLS(*PICK AKM LENGTH)). PLEASE NOTE THAT NEW & SURPLUS GAS TUBES CAN VARY DEPENDING ON COUNTRY OF ORIGIN, CONDITION, AND FINISH. SOME FITTING MAY BE NECESSARY. SPECS: *REMOVABLE AND COMPATIBLE WITH LIKE-PATTERN GAS TUBES (NOT PERMANENTLY ATTACHED) *18G COLD-ROLLED STEEL (VERY SOLID, BUT WITH LITTLE EFFORT CAN BE ADJUSTED FOR FITMENT) * MELONITE COATING (FOR CORROSION RESISTANCE, LUBRICITY, AND ALSO SERVES AS A GREAT BASE FOR THE FINAL FINISH OF YOUR CHOICE) * INTERIOR BRACE WELD (REDUCES VERTICAL MOVEMENT AGAINST TUBE) *MADE IN USA