Screw studs 9x20.8 mm

Specification:
Diameter: 9 mm;
Protrusion above rubber: 7.3 mm;
Needle penetration in the rubber: 13.5 mm;
Total length: 20.8 mm;
Minimum depth: 11 mm;
Tungsten flat head: 2.2 mm;
Minimum width wedge: 12 mm x 12 mm.

Best grip studs have the ability to be installed into any new or used tire, track or shoe whether or not these have stud holes or locations. Normal, off-road, or snow tires can be used, if ground conditions become slippery and endanger personal safety it is not necessary to use specialists to install Bestgrip studs. This can be done by the consumer with simple, fast, and economical equipment. Tires or shoes will immediately have an enhanced level of safety and security. The studs may be removed equally easily when not required and reinstalled again in the future. It is possible to choose and vary the number of studs that are inserted into the tire, or shoe to suit specific needs and applications. All Bestgrip’s studs have a durable tungsten tip providing maximum grip on slippery ground (mud, snow, ice, rocks, grass, roots, etc.).

https://www.best-grip.com/pdf/EN.pdf