WOLF TOOTH - PACK WRENCH CINCH AND ISIS SPLINE WRENCH INSERT EVERY WOLF TOOTH STEEL INSERT IS MACHINED AND NICKEL PLATED IN-HOUSE AT WOLF TOOTH'S MINNESOTA HQ DESIGNED TO BE LIGHTWEIGHT, LEAN AND PAIR PERFECTLY WITH THE WOLF TOOTH PACK WRENCH SOLD SEPARATELY THESE INSERTS ARE IDEAL IF YOU'RE LIKELY TO BE TRAVELLING WITH YOUR BIKE OR WANT A TRAIL-READY MOBILE WRENCH KIT. THIS INSERT FITS OLDER ISIS BOTTOM BRACKETS OR THE RACE FACE CINCH DIRECT MOUNT CHAINRING SYSTEM.