The Lock-Jaw Sport. Lightest, easiest to use, and maximum gripping surface. The lightest of the Lock-Jaw 50mm collar lineup, Lock-Jaw Sport features a patented quick-locking latch and maximum gripping surface area. Proprietary dual compound construction and unique design makes the collars extremely durable but also very lightweight. Holds plates secure and protects bar finish. Fits all 50mm / 2" bars. Designed for all lifts including Bumper Plates, Olympic-Style and Powerlifting. Sold in pairs.