I bought two of this bolt on knob: one for weatherby vanguard S2 and the other for Howa 1500 Legacy Sport superlite. Both of them are made by Howa and are almost identical in most aspects. Bolt on knobs from Tactical Works fit fine and I got what I wanted. One thing is that the rubber rings to be used (included) were too thick. If I use two of them it will have huge opening between knob parts. One was still too thick. What I did was to use rubber shavings and stick them in: shavings gave enough pressure to keep knobs rolling, good pressure to retain halves in place. Do I recommend this knobs? Yes.