CPS BTBXA2 - 1 / 2-7 / 8 Shoe Arm Replacement BTB300 BLACKMAX Premium Tube Bender Replacement Parts for Soft Copper Tube and Solid Aluminum, 0 Degree - 90 Degree Forward or Reverse Color Coded Mandrels - Mechanism reverse bend for tight quarters BLACKMAX TUBE BENDERS (IMPERIAL) Product included below description Mandrel Color BTBX14 ​​1/4 OD Chrome BTBX516 5/16 OD Copper BTBX38 3/8 OD Red BTBX12 1/2 OD Yellow-Orange BTBX58 5 / 8 OD Blue BTBX34 3/4 OD Green BTBX78 7/8 OD 1 / 4-3 / 8 BTBXA1 BTBXA1 Shoe Arm, 1 / 2-7 / 8 BTBXA2, BTBXR1 Shoe Arm, BTBXR2 Reverse Chuck Arm reverse curved shoe, OD = Outside Diameter (of tube)