Chuck, Collet Type Morse Taper Chuck, For Maximum Stud Length 4 in, For Stud Diameter 0.5 in, Stud Welding Process Drawn Arc, For Welder Series ARC-1200, ARC-1800, ARC-3000, ARC-800, Most Drawn Arc Welders, N1500i, N550c, N800i, Nelson Series 4500, Nelweld 4000, Nelweld 6000, ProWeld ARC-656, Overall Diameter 3/8 in, Overall Length 2 1/2 in, Welding Processes Stud Welding, Thread Size 1/2 In.-13, For Minimum Stud Length 5/8 in, For Use With All drawn arc stud welding equipment