SuperATV Heavy Duty 1" Wheel Spacer Adapters for Polaris 12mm Studs to Polaris 3/8" Wheels - Allows You To Run 3/8" Wheels on a Newer Machine with 12mm Studs - Full Set of 4 Adapters 100% Fitment guaranteed 2 pair (4 adapters total) - (1" per adapter) Each pair includes pre-installed wheel studs and nuts Extremely Durable Coverts OE bolt pattern (12mm) to alternative bolt pattern (3/8") 4/156 mm bolt pattern : Polaris 12mm wheel studs to 3/8&#034; wheels. 2 pair (4 adapters total) - (1&#034; per adapter) (4) Adapters with 3/8&#034; studs (16) Open End Short 12mm Acorn Lugnuts (Attach Wheel Adapter To Hub)