In 1981 Schaller developed and received the patent for a new type of carrying strap with a unique design and great functionality. Thirty-seven years later, Schaller built on this with the S-Locks. Equipped with an elegant Lock-Wheel, one-piece hardened steel band buttons, an aesthetic design and perfect handling, they make it easy to be inextricably linked to your instrument.Simply screw with an inbus key (size 3mm/ 1/8"), after which the 4 mm/ 5/32" screw ensures maximum grip on all instruments with existing screws in standard dimensions. The hardened steel and the double thickness of the band knot guarantees maximum safety against breakage, The high-quality felt rings are there to protect the finish of your instrument. The extended wire length allows you to hold tyres up to 6 mm thick with the new straplocks. All S-Locks come in a new and attractive reusable crystal box containing a QR code to a video on how to install it.