Precision Works Subframe Hard Collar Kit - Acura RSX DC5 Civic Si EP3 Civic 2001 - 2015 RearPrecision Works Subframe Hard Collar Kit Made from one piece CNC machined billet aircraft aluminum, these collar inserts fit perfectly between the subframe and the chassis bolts. By installing these hard collar inserts rings, it will eliminate any play between the chassis and subframe, thus increasing vehicle stability and suspension precision. Includes: Complete set for Rear Subframe Total of 12 hard collar inserts Vehicle Applications: Acura RSX DC5