Bought your own barbell to keep at the gym? Then you already know the problem: leave it on the rack and someone else is benching with it by lunch. The Proloc Blocker barbell lock is the simplest way to keep your bar yours. The Blocker is a security collar that clamps onto one sleeve of your Olympic barbell and blocks the loading zone — from the middle of the bar to the end. With the Blocker on, the bar can't be loaded and can't be used, which makes it pointless for anyone to grab. Thread a chain and padlock through it and you can secure your barbell directly to a rack, bar tree, or storage cradle so it stays exactly where you left it. This is theft deterrence done right. The Proloc Blocker won't replace a safe, but it makes your bar more trouble than it's worth to mess with — and that's the whole game in a commercial or public gym. Lifters who keep personal power bars, and Oly bars at globo-gyms, university weight rooms, and shared garage setups use the Blocker every day for exactly this reason. Tightens with the included Allen key (stored right inside the collar), fits all standard Olympic bars and most specialty bars, and comes backed by a 2-year warranty. Made in the USA. One collar included; padlock sold separately. Spec snapshot: Fits sleeves 1.937"–2.007" (all Olympic bars, most specialty bars) Color: Black Includes: 1 Blocker collar + integrated Allen key Lock/chain: not included Warranty: 2 years Origin: Made in USA