Guy at work gave me some 4" QS to try they measured 0.550" figured they were worth a try.....put some on a right offset.....aligned for clearance and stepped out to the range.........ABSOLUTELY BEAUTIFUL! Like a dart!!! Screwed in a muzzy 125 and still like a dart! Just for ****s and giggles I turned the nock to where I should have some contact and whalah same wiggle in flight as I did with the Blazers....So for this year I will be testing out the 4" Quikspins.