Our 21mm Rugby Studs are made from durable aluminium and feature a 5mm thread diameter and are silver in colour. Installation and replacement is made easy with a stud spanner, although pliers can also be used. Compatible with some of the most popular rugby boots, such as Adidas Kakari, Asics Lethal Warno, Canterbury Stampede, Kooga, Mizuno Morelia, Oxen Meta/Raptor, Puma H8 and more. Get the best grip and performance on the pitch. 21mm Long Aluminium Rugby Studs Thread diameter: 5mm Sold individually. Silver in colour. These studs can be tightened or removed with this stud spanner although pliers can also be used. Replacement studs suitable for the following ranges of boots: Adidas Kakari Asics Lethal Warno / Tackle / Charge Canterbury Stampede Kooga Mizuno Morelia / Waitangi / Monarcida OXEN Puma H8