Quick view Arbor Adapter ALL10402 ALLSTAR PERFORMANCE MSRP: Now: $8.99 Was: Arbor Adapter ALL104021/2-20 to 5/8-18Tubing Notcher Adapter - Arbor - 1/2-20 to 5/8-18 in Thread - Steel - Natural - Allstar Tubing Notchers - Each MSRP: Now: $8.99 Was: Quick view