Gone are the days of sagging shift boots, broken plastic shift boot collars, and shift boot collars that don't match the diameter or style of your shift knob. ACUITY designed this Shift Boot Collar Upgrade to allow use of virtually any M10x1.5 shift knob in your car without sacrificing fit and finish between the shift boot and shift knob. This kit includes 2 binding nuts, one meant for flat-bottomed knobs, and the other meant for boss-bottomed knobs (like modern Civic Type R and Honda Factory Performance designs). The supplied binding nuts are turned and milled from stainless steel and have flats for a 12mm open-ended wrench. The boot collar is made from 6061 billet aluminum and receives a tasteful anodized/sandblasted finish before laser etching. Features Collar is 6061 aluminum with satin black anodized finish Nuts are stainless steel construction Included nut and collar clip together for a clean finished appearance Includes nuts that can be used to hold your shift knob in place Vehicles with an M10x1.5mm shifter What's In The Box? 1 - Shift Boot Collar Mounting Hardware Warranty Acuity Limited 1-Year Warranty