1/2-Inch drive，with 1/4 hex quick connect This product, when paired with an electric drill or power wrench, converts a hand crank winch into a motorized/electric winch, saving both effort and time. Applicable to winch drive interfaces for square steel tubes with an inner diameter of 7/8 inch. Replace PA-VIKI2515032 This part is compatible with the following Pop-Up / Tent Camper models: Palomino (1980-Present)，Skamper (All Years)，Viking (1995-2012)，Rockwood (1993-Present)，Starcraft (1994-Present)，Dutchmen (All Years)，Flagstaff (All Years)，Coachmen by Forest River (2009-2012). Heat treated Cr-Mo alloy steel 7/8" Tapered Male Square Drive Adapter / Pipe Plug Socket for Electric Drill, Converts Hand Crank to Motorized Winch for Camper & RV Jacks – Fits Pop-Up, Tent Camper, and RV Models