Bulldog Gear - Mammoth Lite Spotter ArmsThe Mammoth Lite Spotter Arms are compatible with the Mammoth Lite Wall Mounted Rigs, Free Standing Rigs and Squat Racks. They are lined with UHMW Plastic to add further protection against cosmetic damage and wear and tear to both spotter arms and barbells. Spotter arms have a working length of 640mm Made from 80 x 80 x 3mm British RHS Steel Sold as a pair 16mm pins