Always a step ahead with FRANK's self-tapping threaded studs. What is the difference? The stud automatically cleans the thread as it is screwed in and can be fitted at lightning speed. Avoids the dangerous use of thread tappers on the horse. The stud hole can be fitted with rubber plugs when not in use - this prevents dirt and stones getting into the hole. The studs are made of hardened special steel for extra durability. Contains: Stud box, 8 All-round studs 12 mm, 8 Ice studs 12 mm, 1 stud spanner SW 13, 1 screwdriver, 40 Plugs.