Comparison : Item # 4181101, 4-40 (12 SWG) Capacitor Discharge Tapered Base Chuck
Item # 4181351, 6-32 (10 SWG) Capacitor Discharge Tapered Base Chuck
Item # 4181601, 8-32 Capacitor Discharge Tapered Base Chuck
Item # 4181871, #10 Capacitor Discharge Tapered Base Chuck
Item # 4182501, 1/4" Capacitor Discharge Tapered Base Chuck