Description HG Clamps (Collars) for 50mm Olympic Barbell Olympic Barbell Collar inSPORTline for 50mm Olympic Bar – barbell clamp fits 2 inch Olympic bar. Perfect for crossfit workouts, Olympic lifts, overhead press, deadlifts, bench press, or any other workout using 2 inches Olympic Barbell. Material: reinforced plastic, ABS (HIGH Quality: Nylon 662) Package Include: 2 X Clamps Easy to use, one hand install ~ Spring powered Snap-Latch design to keep you safe. These collars are a favorite for crossfit and many other commercial gyms. Additionally here are some great barbell exercises.