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Ridgid 42415 Specifications: Drive Link Assembly (535, 535M & old style) Geared Threader Accessories : No. 840A Universal Drive Shaft A telescoping (41" to 50") drive shaft for operation of Nos. 141 and 161 geared threaders with threading machines. Geared Threader Operation: The Nos. 141 and 161 geared threaders, in conjunction with these accessories, allow power drives and threading machines to thread up to 4" and 6" pipe.