Drill Bit Kit, QA1 Drill Bit Kit, Drill Bit Set, QA1 offers drill bits for customizing pistons on all QA1 large body rebuildable circle track shocks., Drill Bit Kit .033" Thru .059", Drill Bit Kit .033" Thru .059"., QA1 offers drill bits for customizing pistons on all QA1 large body rebuildable circle track shocks..