Stud Welding Studs and Pins; Metal Fasteners and Parts Thereof-Namely, Self-Locking Insulation Washers, Speed Washers, Collets, Collet Inserts, and Collet Stops and Protectors; Chucks; and Face Plates, Legs, Feet, Spark Shields, Ferrules and Ferrule Grips for Welding Gun Tripods