I bought this to replace the tuners on my Schecter bass, as the tuners (made by Schecter) had partly disintegrated over time! Anyway, they were a tight fit (not a bad thing), screws in well and are just great! Even at high tension they are easy and fluid to move while retaining tuning perfectly. I really just love these. The best part is also that they come in singles since my lass has a strange 2L 3R configuration (most are 3L 2R), so buying a 2 x 2 set and one extra is almost impossible. I can't say enough nice things about these machine heads!