Schaller S-Locks L - Ruthenium

The S-Locks strap button
new and unique one-piece construction, easy to install via 3 mm (1/8") Allen key
special 4.5 mm wood thread in S-Lock size L for maximum grip. Optionally available in sizes S (3.5 mm) and M (4.0 mm).
hardest steel for maximum wear resistance and safety
including high-grade felt washers to protect your instrument

The S-Locks improved lock
extended thread length for holding straps of up to 6 mm thickness
newly designed slanted locking bolt made of stainless steel for minimum wear and thus maximum safety
new design pull-up ball for best haptics
suitable for a standard hole in the belt of 10 mm

The improved S-Locks-Wheel: featuring 3-stage safety concept
Lock-Wheel with special patent thread ensures a secure hold. It can be tightened safely by hand without tools.
The 2-hole mount (suitable for 2 mm Allen key or screwdriver) allows a firmer tightening torque of the Lock-Wheel with maximum hold.
Undetachable hold due to grub screw with tapered cap and slot M2.5 x 5 mm made of stainless steel. Simply unscrew the set screw again to unscrew the Lock-Wheel; the thread remains functional and cuts itself "free" again through the Lock-Wheel.

Final
Put all parts together and give it a shake
Sounds of silence - You will be amazed: Whether on stage or in the studio, S-Locks do not rattle.