Square Drive Adapter, Compatible Threader Grainger Part Number 1AC02, 6YJ38, Compatible Threader Series 258 Power Pipe, 258XL Power Pipe, 700 Power Drive, Product Type Square Drive Adapter, Features 15/16 in Square Bore, Turns Equipment with A 15/16 in Drive Shaft When Inserted Into 1AC02 Power Drive, For Use With 1AC02, 6YJ38, 161 Geared Threader, 258 Power Pipe Cutter