This special conversion kit is meant for any 39mm Royal Oak Offshore that is in steel. Replacement Conversion Kit fit for Audemars Piguet AP Royal-Oak 39mm model Such as : 15400ST.OO.1220ST.01 15400ST.OO.1220ST.02 15400OR.OO.D088CR.01 15400OR.OO.1220OR.01 Convert your Audemars Piguet from bracelet to strap! Our end pieces are milled from solid blocks of 316L Stainless Steel. We only used the best to ensure a perfect fit onto your Audemars Piguet watch case. One grain (without accessories) Another important component of the conversion kits are the bar and cap sets. These are also milled from 316L stainless steel. Included in the AP Bands Conversion Kit: 1. 4 AP Bands Conversion Kit End Links (These are used for connecting the Band to Watch Caes) 2. 2 AP Bands Conversion Kit Bar (These are used for connecting the Band to the Bolt) 3. 4 Short Watch Tube（These are used for connecting the Bolt to Watch Case） 4. Screwdriver Before ordering any watch parts, please make sure, that you are ordering correct part ( size, color, material) If you don't know how to change parts, please take it to jeweler. All parts are checked before dispatch. If you have any questions, feel free to ask them.