Description
String changes shouldn’t feel like a chore, and staying in tune shouldn’t be a gamble every time you dig into a low end groove. This Sperzel Trim-Lok 4 in-line set for bass swaps the old wrap-and-wind routine for a locking mechanism that clamps the string and holds it there — no multiple wraps, no slipping, no drift mid-set.
- Genuine, factory-fresh Sperzel Trim-Lok tuners for 4 in-line bass headstocks
- Finished in Black, full manufacturer warranty
- Fits headstocks with a 7/16″ (11.1 mm) tuner hole
- Rated for string gauges up to 0.125″
Each tuning key is machined from solid billet aluminum, not stamped or cast, so you get real precision: shaft wobble, endplay, and backlash are engineered out at the tolerance stage. That translates to a bass that actually holds pitch under stage lighting, sweaty hands, and heavy right-hand attack — the stuff that matters when you’re locked in with a drummer and can’t afford a tuner check between songs.
Trim-Lok’s locking design isn’t just for trem guitars — it works fine on any bass, and it means you can restring fast at a gig without fumbling for extra string length to wrap. Less time fiddling with pegs, more time on the low end.
We’re an authorized Sperzel dealer sourcing direct from the factory, and we run these same tuners on our own basses. Every set ships with full factory warranty, and if you’ve got questions about fitment or specs, reach out before you order.
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